Revert "[LoopVectorize][PowerPC] Estimate int and float register pressure...

Revert "[LoopVectorize][PowerPC] Estimate int and float register pressure separately in loop-vectorize"

Also Revert "[LoopVectorize] Fix non-debug builds after rL374017"

This reverts commit 9f41decc.
This reverts commit 18b6fe07.

The patch is breaking PowerPC internal build, checked with author, reverting
on behalf of him for now due to timezone.

llvm-svn: 374091