[X86] Remove patterns and ISD nodes for the old scalar FMA intrinsic lowering.

We now use llvm.fma.f32/f64 or llvm.x86.fmadd.f32/f64 intrinsics that use scalar types rather than vector types. So we don't these special ISD nodes that operate on the lowest element of a vector.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@336883 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed