[X86] Remove the value type operand from the floating point load/store...

[X86] Remove the value type operand from the floating point load/store MemIntrinsicSDNodes. Use the MemoryVT instead. NFCI

We already have the memory VT, we can just match from that during isel.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353797 91177308-0d34-0410-b5e6-96231b3b80d8