Port all babel-parser changes from 2018-11-13 to 2019-01-24

[alangpierce]

Progress toward #437

Notes about each change:
4e1d6e7ff v7.1.6
🚫 Release only.

a2afb974b Fix parsing typescript function types with destructuring (#9035)
🚫 Already fixed with #278.

445b14148 Better error for disallowed trailing commas/parameters after rest elements (#9046)
🚫 Just error reporting.

e7f0c065c Bump some deps (#9056)
🚫 Nothing to do.

4f16a12c0 Fix bug with parsing TS generic async arrow function (#9055)
🚫 Sucrase seems unaffected by bug.

d2971a195 Fix compatibility between typescript and jsx plugins in interface declarations (#9058)
🚫 Sucrase seems unaffected by bug.

856edbf95 [flow] Allow type casts in array patterns inside arrow parameters (#9069)
🚫 Bug caused by error reporting, doesn't affect Sucrase.

61f2aed5b Disallow await inside arrow functions (#9074)
🚫 Error handling out of scope for Sucrase.

07eaa3c63 Ignore empty fixture directories and fix fixtures in the parser (#9113)
🚫 Test-only.

393283053 Parse non-octals with leading zeros in non strict mode correctly (#9114)
🚫 Sucrase assumes strict mode, so this doesn't apply.

fa9df678a Move tests from babylon to babel-parser and enable one test that works now
🚫 Test-only.

fdc869ce1 Merge pull request #8289 from valtech-nyc/implement-smart-pipeline-in-parser
✅ Almost all logic was for error-reporting and complexity around node creation, but
I did add # as a valid expression.

282129ea6 v7.2.0
🚫 Release only.

4ca35ef8b Fix running flow on travis and update flow (#9128)
🚫 Types only.

72471aff6 Handle flow comments with leading spaces (#9168)
🚫 Sucrase doesn't do anything special for flow comments.

c1499b13a v7.2.2
🚫 Release only.

5cb38995c Allow keywords to be used in type annotations (#9184)
✅ I also fixed this for TypeScript.

0bb720401 v7.2.3
🚫 Release only.

b5177ce29 babel-parser: typescript: add missing bigint keyword (#9230)
🚫 Test only.

60ffe1d10 parser, smart pipes: Add test for async–await
🚫 Test only.

c586d4e8c parser, smart pipes: Add support for yield in pipeline bodies
🚫 Only validation change, startsExpr was removed from Sucrase.

a58893d1e Ensure modifiers are included in TSParameterProperty ranges (#9276)
🚫 AST only.

e43777bb5 Fix location for typescript type assertions in AST (#9284)
🚫 AST only, wasn't a problem in Sucrase tokens.

03022d169 Throw error if TypeScript class has empty implements (#9292)
🚫 Error handling only.

46e3f6df1 @babel/parser: include leading character into range of generic ArrowFunctionExpression (#9295)
🚫 AST only.

2cc037675 @babel/parser(ts): Add parsing of type import (#9302)
🚫 Already done in #380.

9764718c3 Disallow trailing comma after rest (#9311)
🚫 Error handling only.

5889620a6 Disallow new import(x) and import(x,) (#9313)
🚫 Error handling only.

3e4b608a8 Parse class heritage as strict mode code (#9315)
🚫 Sucrase is always in strict mode.

694e3fd8c Merge declaration and init of props in parser's state (#9312)
🚫 Refactor that isn't relevant to Sucrase.

e8038863c Fix range on TypeScript this type predicate (#9339)
🚫 AST only.

34c9890f4 Fix range on TypeScript index signature parameters (#9335)
🚫 AST only.

aaec2cd51 Fix handling newline with TypeScript declare and abstract classes (#9328)
✅ Implemented newline checking in various places.

0a88230ec Disallow async functions as loop bodies (#9314)
🚫 Error handling only.

a2e6d8e96 Disallow usage of invalid keyword after export abstract statement in Typescript (#9336)
🚫 Error handling only.

96a734314 Merge pull request #9348 from danez/perf
🚫 Nothing stood out as being valuable to incorporate.

f6ee26c3d v7.3.0
🚫 Release only.

af88e63df fix new keyword broken by recent refactoring (#9377)
🚫 Not relevant in Sucrase.

f2af6c117 v7.3.1
🚫 Release only.

f77c450cd Bump prettier (#9373)
🚫 Tooling only.

65febdd13 Refactor import and export parsing (#9326)
🚫 Skipping refactor for now since it's not clear that I'll need it.

93e1b5e61 Merge pull request #9375 from danez/contextual-let
🚫 Not necessary for strict mode.

8bc9f9a05 fix: Allow toplevel await when option true and correctly mark await keyword as unexpected (#9371)
🚫 Error handling only.

42c5d3fc4 Correctly fail for invalid yield in for (#9398)
🚫 Error handling only.

46ba5940c Make yield a contextual keyword (#9400)
🚫 Not necessary for strict mode.

7dc157f9b Fix location/range on TypeScript ExportNamedDeclarations (#9406)
🚫 AST only.

[codecov-io]

Codecov Report

Merging #439 into master will increase coverage by 0.44%.
The diff coverage is 70%.

@@            Coverage Diff             @@
##           master     #439      +/-   ##
==========================================
+ Coverage   80.65%   81.09%   +0.44%     
==========================================
  Files          49       49              
  Lines        5123     5370     +247     
  Branches     1199     1204       +5     
==========================================
+ Hits         4132     4355     +223     
- Misses        690      716      +26     
+ Partials      301      299       -2

Impacted Files	Coverage Δ
src/parser/traverser/expression.ts	83.29% <100%> (+0.56%)	⬆️
src/parser/plugins/typescript.ts	78.95% <64.28%> (+2.38%)	⬆️
src/parser/plugins/flow.ts	62.5% <75%> (-1.3%)	⬇️
src/util/formatTokens.ts	70.58% <0%> (-10.06%)	⬇️
src/parser/util/identifier.ts	90.9% <0%> (-4.1%)	⬇️
src/parser/plugins/jsx/index.ts	91.33% <0%> (-1.48%)	⬇️
src/util/getClassInfo.ts	85.12% <0%> (-1.21%)	⬇️
src/identifyShadowedGlobals.ts	87.8% <0%> (-1.09%)	⬇️
src/parser/traverser/statement.ts	81.12% <0%> (-1%)	⬇️
... and 21 more

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