[TargetLowering] try to create -1 constant operand for math ops via demanded bits

This reverses instcombine's demanded bits' transform which always tries to clear bits in constants.

As noted in PR35792 and shown in the test diffs:
https://bugs.llvm.org/show_bug.cgi?id=35792
...we can do better in codegen by trying to form -1. The x86 sub test shows a missed opportunity. 

I did investigate changing instcombine's behavior, but it would be more work to change 
canonicalization in IR. Clearing bits / shrinking constants can allow killing instructions, 
so we'd have to figure out how to not regress those cases.

Differential Revision: https://reviews.llvm.org/D42986

llvm-svn: 324839