Add support for partial redefs to the fast register allocator.

A partial redef now triggers a reload if required. Also don't add
<imp-def,dead> operands for physical superregisters.

Kill flags are still treated as full register kills, and <imp-use,kill> operands
are added for physical superregisters as before.

llvm-svn: 104167
1 file changed
tree: c0430783dbfa18df9c5af764eecdc355d595aed5
  1. clang/
  2. compiler-rt/
  3. libcxx/
  4. llvm/