MIPS: unwind, don't save/restore hi/lo for R6

HI/LO registers have been removed in MIPSr6. Save and restore them only for pre-R6.

We keep the memory space for the registers so that we can use the same register indexes for
r6 and pre-r6.

Fixes: #60682

Reviewed By: compnerd

Differential Revision: https://reviews.llvm.org/D156283

GitOrigin-RevId: 22a84020d2324ac1f753705497a40c43d8284d94
4 files changed
tree: d54fc473d4072ac09781954332768fc176da0431
  1. cmake/
  2. docs/
  3. include/
  4. src/
  5. test/
  6. .clang-format
  7. CMakeLists.txt
  8. LICENSE.TXT