[AMDGPU] Update lit test.

Author: harrisonGPU

llvm/test/CodeGen/AMDGPU/sched-image-sample-post-RA.mir

@@ -1,6 +1,6 @@
 # NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
-# RUN: llc -mtriple=amdgcn -mcpu=gfx1100 -run-pass=postmisched -verify-misched -o - %s | FileCheck -check-prefix=TopDown %s
-# RUN: llc -mtriple=amdgcn -mcpu=gfx1100 -run-pass=postmisched -misched-postra-direction=bottomup -verify-misched -o - %s | FileCheck -check-prefix=BottomUp %s
+# RUN: llc -mtriple=amdgcn -mcpu=gfx1100 -run-pass=postmisched -verify-misched -o - %s | FileCheck -check-prefix=TOPDOWN %s
+# RUN: llc -mtriple=amdgcn -mcpu=gfx1100 -run-pass=postmisched -misched-postra-direction=bottomup -verify-misched -o - %s | FileCheck -check-prefix=BOTTOMUP %s
 
 # This test demonstrates how bottom-up scheduling moves IMAGE_SAMPLE instructions
 # earlier compared to top-down scheduling.