[llvm] [AMDGPU] Support bottom-up postRA scheduing. (PR #135295)

[Harrison Hao via llvm-commits]

================
@@ -1,5 +1,6 @@
 # NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
-# RUN: llc -mtriple=amdgcn -mcpu=gfx908 -misched-cluster=false -run-pass=postmisched -verify-misched -o - %s | FileCheck %s
+# RUN: llc -mtriple=amdgcn -mcpu=gfx908 -misched-cluster=false -run-pass=postmisched -verify-misched -o - %s | FileCheck -check-prefix=CHECK %s
+# RUN: llc -mtriple=amdgcn -mcpu=gfx908 -misched-cluster=false -run-pass=postmisched -misched-postra-direction=bottomup -verify-misched -o - %s | FileCheck -check-prefix=CHECK-BOTTOMUP %s
----------------
harrisonGPU wrote:

I have removed it and added a new test. This test demonstrates scheduling an image‑sample instruction, and I’ve already simplified the lit test to keep it small.

https://github.com/llvm/llvm-project/pull/135295