[X86][Btver2] Correctly distinguish between scheduling pipe and functional unit for...

[X86][Btver2] Correctly distinguish between scheduling pipe and functional unit for JWriteResFpuPair defs

Jaguar's FPU has 2 scheduler pipes (JFPU0/JFPU1) which forward to multiple functional sub-units each. We need to model that an micro-op will both consume the scheduler pipe and a functional unit.

This patch just handles the ops defined through JWriteResFpuPair, I'll go through the custom cases later.

llvm-svn: 327791