[X86] Add isel patterns for commuting X86adc_flag with a load in the LHS.

The peephole pass likely gets this normally, but we should be doing it during isel.

Ideally we'd just make the X86adc_flag pattern SDNPCommutable, but the tablegen doesn't handle that when one of the operands is a register reference.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@341596 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed