kCodeAgeShift    4111 src/objects-inl.h   return (compiler_hints() >> kCodeAgeShift) & kCodeAgeMask;
kCodeAgeShift    4116 src/objects-inl.h   int hints = compiler_hints() & ~(kCodeAgeMask << kCodeAgeShift);
kCodeAgeShift    4117 src/objects-inl.h   set_compiler_hints(hints | ((code_age & kCodeAgeMask) << kCodeAgeShift));