Usually pointer tag will match tag in the shadow, so we can keep
inlining this check keeping the rest in outlined part.
It imroves performance by about 25%, but increases code size by 30%.
Existing outlining reduces performance by 30%, but saves code size by 80%.
So we still significantly reduce code size with minimal performance loss.
Reviewed By: fmayer
Differential Revision: https://reviews.llvm.org/D159172
be601928e1