Simplify how regexs are incrementally parsed.

Conflicts:
	tests/Fidelity/incremental/IncrementalParserTests.ts
	tests/Fidelity/parser/ecmascript5/MissingTokens/MissingToken2.ts.expected
	tests/Fidelity/parser/ecmascript5/RegressionTests/645086_1.ts.expected
	tests/Fidelity/parser/ecmascript5/RegressionTests/645086_2.ts.expected
	tests/Fidelity/parser/ecmascript5/RegularExpressions/RegularExpressionDivideAmbiguity4.ts.expected
	tests/Fidelity/parser/ecmascript5/SyntaxWalker.generated.ts.expected
	tests/Fidelity/program.js
	tests/Fidelity/program.js.map
	tests/Fidelity/scanner/ecmascript5/StringLiterals.ts.expected
	tests/Fidelity/test262/suite/ch07/7.3/S7.3_A2.1_T2.js.expected
	tests/Fidelity/test262/suite/ch07/7.3/S7.3_A2.2_T2.js.expected
	tests/Fidelity/test262/suite/ch07/7.4/S7.4_A3.js.expected
	tests/Fidelity/test262/suite/ch07/7.4/S7.4_A4_T1.js.expected
	tests/Fidelity/test262/suite/ch07/7.4/S7.4_A4_T4.js.expected
	tests/Fidelity/test262/suite/ch07/7.8/7.8.4/S7.8.4_A1.1_T1.js.expected
	tests/Fidelity/test262/suite/ch07/7.8/7.8.4/S7.8.4_A1.1_T2.js.expected
	tests/Fidelity/test262/suite/ch07/7.8/7.8.4/S7.8.4_A1.2_T1.js.expected
	tests/Fidelity/test262/suite/ch07/7.8/7.8.4/S7.8.4_A1.2_T2.js.expected
	tests/Fidelity/test262/suite/ch07/7.8/7.8.4/S7.8.4_A3.1_T1.js.expected
	tests/Fidelity/test262/suite/ch07/7.8/7.8.4/S7.8.4_A3.1_T2.js.expected
	tests/Fidelity/test262/suite/ch07/7.8/7.8.4/S7.8.4_A3.2_T1.js.expected
	tests/Fidelity/test262/suite/ch07/7.8/7.8.4/S7.8.4_A3.2_T2.js.expected
	tests/Fidelity/test262/suite/ch07/7.8/7.8.5/S7.8.5_A1.2_T2.js.expected
	tests/Fidelity/test262/suite/ch07/7.8/7.8.5/S7.8.5_A1.3_T1.js.expected
	tests/Fidelity/test262/suite/ch07/7.8/7.8.5/S7.8.5_A1.3_T3.js.expected
	tests/Fidelity/test262/suite/ch07/7.8/7.8.5/S7.8.5_A1.5_T1.js.expected
	tests/Fidelity/test262/suite/ch07/7.8/7.8.5/S7.8.5_A1.5_T3.js.expected
	tests/Fidelity/test262/suite/ch07/7.8/7.8.5/S7.8.5_A2.2_T1.js.expected
	tests/Fidelity/test262/suite/ch07/7.8/7.8.5/S7.8.5_A2.3_T1.js.expected
	tests/Fidelity/test262/suite/ch07/7.8/7.8.5/S7.8.5_A2.3_T3.js.expected
	tests/Fidelity/test262/suite/ch07/7.8/7.8.5/S7.8.5_A2.5_T1.js.expected
	tests/Fidelity/test262/suite/ch07/7.8/7.8.5/S7.8.5_A2.5_T3.js.expected
	tests/Fidelity/test262/suite/ch08/8.4/S8.4_A13_T1.js.expected
	tests/Fidelity/test262/suite/ch08/8.4/S8.4_A13_T2.js.expected
	tests/Fidelity/test262/suite/ch08/8.4/S8.4_A14_T1.js.expected
	tests/Fidelity/test262/suite/ch08/8.4/S8.4_A14_T2.js.expected
Update the new scanner to follow the new regex scanning rules.
Merge pull request #1189 from Microsoft/incrementalRegex

Simplify how regexs are incrementally parsed.