RegExp Perf: improve CheckCharacters based on ia32 version
RegExp Perf: improve CheckGreedyLoop based on ia32 version
RegExp Perf: improve CheckNotBackReferenceIgnoreCase by using loop index and cleanup comments
RegExp Perf: improve CheckNotBackReference by using loop index and cleanup comments
RegExp Perf: improve CheckCharacterAfterAnd and cleanup comments
RegExp Perf: improve CheckNotCharacterAfterAnd and cleanup comments
RegExp Perf: improve CheckNotCharacterAfterMinusAnd
RegExp Perf: improve CheckCharacterInRange and CheckCharacterNotInRange
RegExp Perf: improve CheckBitInTable by removing add instr (place the value in offset)