Fix simulator overflow check bug in cfdbr, case: round towards -inf
Fix little-endian off-by-one bug in CheckPageFlag
Fix asi offset out of range
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)
RegExp Perf: improve ABI setup in GetCode
RegExp Perf: improve WriteCurrentPositionToRegister
RegExp Fix: should be SubP in WriteStackPointerToRegister
RegExp Perf: improve SafeCall, SafeReturn and SafeCallTarget -- store real addresses other than relative addresses
RegExp Perf: improve LoadCurrentCharacterUnchecked by using index reg and offset