Revert "Update third_party/intel/lib/TritonIntelGPUToLLVM/LoadStoreOpToLLVM.cpp"

This reverts commit a6c1ba3.

Author: januszjah

third_party/intel/lib/TritonIntelGPUToLLVM/LoadStoreOpToLLVM.cpp

@@ -41,9 +41,8 @@ namespace {
 
 static Value skipCasts(Value v) {
   Operation *def = v.getDefiningOp();
-  if (Operation *def =
-          dyn_cast_or_null<LLVM::TruncOp, LLVM::SExtOp, LLVM::ZExtOp,
-                           LLVM::BitcastOp>(v.getDefiningOp()))
+  if (def &&
+      isa<LLVM::TruncOp, LLVM::SExtOp, LLVM::ZExtOp, LLVM::BitcastOp>(def))
     return def->getOperand(0);
   return v;
 }