[X86] Remove the last of the 'x86.fma.' intrinsics and autoupgrade them to 'llvm.fma'. Add upgrade tests for all.

Still need to remove the AVX512 masked versions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@336383 91177308-0d34-0410-b5e6-96231b3b80d8
7 files changed