[SelectionDAG] Add VT consistency checks to the creation of ISD::FMA.

This is similar to what is done for binops. I don't know if this would have helped us catch the bug fixed in r336566 earlier or not, but I figured it couldn't hurt.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@336576 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed