Port babel-parser changes from 2019-04-01 to 2019-09-06

[alangpierce]

Progress toward #483

c7587c016 Don't accept '\08' or '\09' in strict mode (#9769)
🚫 Validation change, not relevant for Sucrase.

508fde400 v7.4.3
🚫 Release only

338853b5d Fix parsing typescript bodiless methods with the estree plugin also enabled (#9890)
🚫 AST-only

4198d91b8 Fix: remove constant context type check for TS (#9869)
🚫 Validation-only

d7757f6d0 Fix TypeScript readonly error location (#9887)
🚫 Error-handling only

cf3668779 Always register global bindings as exportable (#9865)
🚫 Scope code not relevant to Sucrase

30d507c91 Add TS support to @babel/parser's Scope (#9766)
🚫 Sucrase deals with scope differently and generally doesn't need to implement
TS scope.

277a2620c allow directives and other comments before flow pragma (#9891)
🚫 We already remove all flow pragmas everywhere.

2c8869438 v7.4.4
🚫 Release only

555d50a08 Generate missing test output
🚫 Test only

354666aa1 fix: allow shebang directive (#9922)
🚫 We already handle shebangs and remove flow pragmas.

85432e2c4 Remove guardedHandlers from ASTs (#9979)
🚫 AST-only

47eb1ddfe Do not use lookahead when parsing dynamic import or import.meta (#9983)
✅ Implemented in a slightly different way with new tests.

4da7a01aa Avoid unnecessary work during lookahead (#9982)
🚫 Not relevant here

c2d303f8b Do not use lookahead when parsing declare module or declare module.exports in flow (#9985)
✅ Straightforward port.

5661de590 Do not use lookahead when parsing imports in declare module in flow (#9987)
🚫 Code removed from Sucrase.

3f0590de2 Do not use lookahead when parsing jsx expression containers (#9988)
✅ Ported in a similar way to original code.

b1826bf0a Only compute Position if not already in state (#9989)
🚫 Not relevant for Sucrase.

f5b814058 Do not use lookahead when parsing construct signature declarations (#9995)
✅ Ported in similar way to original code, removed unnecessary enum.

9c06e4ed4 avoid exceptions for control flow (#9974)
🚫 Sucrase already avoids exceptions.

54d257c10 Fix location for optional params in arrow functions (#9998)
🚫 AST-only change.

33ab4f166 v7.4.5
🚫 Release only.

888b9f694 Remove unused code in the TS parser plugin (#10025)
🚫 Already removed from Sucrase.

fdbbb743b flow - allow type parameter defaults in function declarations (#10084)
🚫 Nothing to do, we already allow defaults in function type parameters.

11fa2461c Disallow "let" as name at lexical bindings (#10099)
🚫 Validation-only.

1d3f9815d fix import typeof in declare module (#10132)
🚫 Code doesn't exist in Sucrase.

ca67637da [@babel/parser] Add "allowUndeclaredExports" option (#9864)
🚫 Validation-only.

8bf9714d6 [legacy decorators] Allow decorating generator methods (#9912)
🚫 Sucrase doesn't support legacy decorators.

6b8a37c41 Implement f# pipeline in parser (#9450)
🚫 I'll leave out support for F# pipelines for now.

0bf0ae341 Fix typos (#10153)
🚫 Not relevant for Sucrase.

f588e4ec4 BigInt type for Flow (#10091)
🚫 No changes necessary.

49da9a07c v7.5.0
🚫 Release only.

7f47cb65d Add Pipeline nodes to ast.spec [skip ci] (#10214)
🚫 Docs only.

d8da63c92 Use correct extension for typescript fixtures (#10014)
🚫 Test only.

0407f034f v7.5.5
🚫 Release only.

1e7ed5c46 Add allowUndeclaredExports option to typings. (#10263)
🚫 Types only.

f160522ab updated ParsePlugin type definition (#10259)
🚫 Types only.

4f0840ab8 Update dev dependencies and fix linting errors (#10228)
🚫 Formatting only.

75090f10e fix: assign comment to ObjectProperty only when inside an ObjectExpression (#10292)
🚫 Comment parsing only, not relevant for Sucrase.

15aa511b8 Do not register ambient classes to the TS scope (#10352)
🚫 Scope code not relevant for Sucrase.

1664cce68 Don't allow JSXNamespacedName to chain (#10366)
🚫 Validation only.

8a775a32b Retain trailing comments in array expressions (#10369)
🚫 Comment only.

c0e3fa008 Refactor trailing comma comment adjustment (#10380)
🚫 Comment only.

b02e35c19 Fix parenthesis for nullish coalescing (#10269)
✅ Updated precedence for operators.

da0af5fd9 V8intrinsic syntax plugin (#10148)
✅ Added case to the start of parseExprAtom.

[codecov-io]

Codecov Report

Merging #485 into master will increase coverage by 0.14%.
The diff coverage is 84.61%.

@@            Coverage Diff             @@
##           master     #485      +/-   ##
==========================================
+ Coverage   81.59%   81.74%   +0.14%     
==========================================
  Files          52       52              
  Lines        5200     5192       -8     
  Branches     1207     1206       -1     
==========================================
+ Hits         4243     4244       +1     
+ Misses        667      661       -6     
+ Partials      290      287       -3

Impacted Files	Coverage Δ
src/parser/plugins/flow.ts	65% <0%> (+0.18%)	⬆️
src/parser/plugins/jsx/index.ts	92.8% <100%> (ø)	⬆️
src/parser/tokenizer/types.ts	58% <100%> (ø)	⬆️
src/parser/plugins/typescript.ts	80.11% <57.14%> (-0.15%)	⬇️
src/parser/traverser/expression.ts	84.24% <88.88%> (+1.43%)	⬆️
src/parser/tokenizer/index.ts	75.23% <0%> (+0.23%)	⬆️

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