Consolidate duplicate tests

There were a few tests already in the tree that overlapped ones that I
added in the previous commit. I've consolidated these and taken
information from the deleted ones where applicable, and improved on the
autogenerated assertion messages.

test/built-ins/Temporal/Calendar/prototype/dateAdd/overflow-invalid-string.js

@@ -11,10 +11,12 @@ info: |
       1. Return ? GetOption(_normalizedOptions_, *"overflow"*, « String », « *"constrain"*, *"reject"* », *"constrain"*).
     sec-temporal.calendar.prototype.dateadd step 7:
       7. Let _overflow_ be ? ToTemporalOverflow(_options_).
-features: [Temporal]
+features: [Temporal, arrow-function]
 ---*/
 
 const calendar = new Temporal.Calendar("iso8601");
 const date = new Temporal.PlainDate(2000, 5, 2, calendar);
 const duration = new Temporal.Duration(3, 3, 0, 3);
-assert.throws(RangeError, () => calendar.dateAdd(date, duration, { overflow: "other string" }));
+assert.throws(RangeError,
+    () => calendar.dateAdd(date, duration, { overflow: "other string" }),
+    "Value for overflow not one of the allowed string values");

test/built-ins/Temporal/Calendar/prototype/dateFromFields/fields-not-object.js

@@ -4,11 +4,17 @@
 /*---
 esid: sec-temporal.calendar.prototype.datefromfields
 description: Throw a TypeError if the fields is not an object
-features: [Symbol, Temporal]
+info: |
+  4. If Type(_fields_) is not Object, throw a *TypeError* exception.
+features: [BigInt, Symbol, Temporal, arrow-function]
 ---*/
 
-const tests = [undefined, null, false, "string", Symbol("sym"), Math.PI, 42n];
+const tests = [undefined, null, true, false, "string", Symbol("sym"), Infinity, NaN, Math.PI, 42n];
 const iso = Temporal.Calendar.from("iso8601");
 for (const fields of tests) {
-  assert.throws(TypeError, () => iso.dateFromFields(fields, {}));
+  assert.throws(
+    TypeError,
+    () => iso.dateFromFields(fields, {})
+    `dateFromFields(${typeof fields}) throws a TypeError exception`
+  );
 }

test/built-ins/Temporal/Calendar/prototype/dateFromFields/overflow-invalid-string.js

@@ -13,8 +13,10 @@ info: |
       2. Let _overflow_ be ? ToTemporalOverflow(_options_).
     sec-temporal.calendar.prototype.datefromfields step 6:
       6. Let _result_ be ? ISODateFromFields(_fields_, _options_).
-features: [Temporal]
+features: [Temporal, arrow-function]
 ---*/
 
 const calendar = new Temporal.Calendar("iso8601");
-assert.throws(RangeError, () => calendar.dateFromFields({ year: 2000, month: 5, day: 2 }, { overflow: "other string" }));
+assert.throws(RangeError, () => calendar.dateFromFields({ year: 2000, month: 5, day: 2 },
+      { overflow: "other string" }),
+    "Value for overflow not one of the allowed string values");