Add gitter
Use add instead of inc
Move EmitBINARY_DIVIDE to compiler_arithmetic.h
Subtract number mask intead of adding double offset
Encode NaN with double offset
Implement BINARY_DIVIDE fast path
Cleanup divide load double code
Merge Type and TypeEntry
Add BINARY_ADD / BINARY_MULTIPLY fast path
Add BINARY_SUBTRACT fast path
Handle -0.0 and +0.0 boxing
Add test262
Merge branch 'master' into llvm