Fix building with GCC 12:

Fixes: https://bugs.llvm.org/show_bug.cgi?id=52380

Differential Revision: https://reviews.llvm.org/D112990

(cherry picked from commit c502902)

Author: marxin

llvm/lib/Target/AMDGPU/SILoadStoreOptimizer.cpp

@@ -2048,7 +2048,7 @@ SILoadStoreOptimizer::collectMergeableInsts(
     // adjacent to each other in the list, which will make it easier to find
     // matches.
     MergeList.sort(
-        [] (const CombineInfo &A, CombineInfo &B) {
+        [] (const CombineInfo &A, const CombineInfo &B) {
           return A.Offset < B.Offset;
         });
     ++I;