Add StringAtom node
Prepare for implementing SimpleCase
Implement efficient byte check
Fix fiber memory corruption created from original fiber
Cleanup ExecGlobal code
Revert "Cleanup ExecGlobal code"

This reverts commit 4e09f2cd475d2e78f24d6f90d17bd04c29fc61c1.
Cosmetic change for ExecGlobal
Add comment about SSE to aero::JIT
[aero] Jump from backtracking phase directly
Update xbyak to version 4.50
Merge branch 'aero-optimize'

Conflicts:
	iv/lv5/jsregexp.h