[Lanai] Use backwards scavenging in frame index elimination
authorJay Foad <jay.foad@amd.com>
Mon, 15 May 2023 15:58:16 +0000 (16:58 +0100)
committerJay Foad <jay.foad@amd.com>
Thu, 18 May 2023 08:58:45 +0000 (09:58 +0100)
commita2916016d825d4ad2011a70ca93e08a215bcdcfc
treef6b9332963e2be4d84ba1a5007cc40c1b0fec2c2
parenta8dd9f42b7f437b233b1cd98e0c4c12aa2fab2f4
[Lanai] Use backwards scavenging in frame index elimination

This is preferred because it does not rely on accurate kill flags.

Differential Revision: https://reviews.llvm.org/D150600
llvm/lib/Target/Lanai/LanaiRegisterInfo.cpp
llvm/lib/Target/Lanai/LanaiRegisterInfo.h