[AMDGPULowerBufferFatPointers] Don't try to preserve flags for consta…

…nt expressions

We expect all of these ConstantExpr ctors to fold away, don't try
to preserve flags, especially as the flags are not correct.

llvm/lib/Target/AMDGPU/AMDGPULowerBufferFatPointers.cpp

@@ -680,35 +680,28 @@ Constant *FatPtrConstMaterializer::materializeBufferFatPtrConst(Constant *C) {
       report_fatal_error(
           "Scalable vector or unsized struct in fat pointer GEP");
     Constant *OffAccum = nullptr;
-    // Accumulate offsets together before adding to the base in order to
-    // preserve as many of the inbounds properties as possible.
     for (auto [Arg, Multiple] : VariableOffs) {
       Constant *NewArg = InternalMapper.mapConstant(*cast<Constant>(Arg));
       NewArg = ConstantFoldIntegerCast(NewArg, OffTy, /*IsSigned=*/true, DL);
       if (!Multiple.isOne()) {
         if (Multiple.isPowerOf2()) {
           NewArg = ConstantExpr::getShl(
-              NewArg,
-              CE->getIntegerValue(
-                  OffTy, APInt(BufferOffsetWidth, Multiple.logBase2())),
-              /*hasNUW=*/InBounds, /*HasNSW=*/InBounds);
+              NewArg, CE->getIntegerValue(OffTy, APInt(BufferOffsetWidth,
+                                                       Multiple.logBase2())));
         } else {
-          NewArg =
-              ConstantExpr::getMul(NewArg, CE->getIntegerValue(OffTy, Multiple),
-                                   /*hasNUW=*/InBounds, /*hasNSW=*/InBounds);
+          NewArg = ConstantExpr::getMul(NewArg,
+                                        CE->getIntegerValue(OffTy, Multiple));
         }
       }
       if (OffAccum) {
-        OffAccum = ConstantExpr::getAdd(OffAccum, NewArg, /*hasNUW=*/InBounds,
-                                        /*hasNSW=*/InBounds);
+        OffAccum = ConstantExpr::getAdd(OffAccum, NewArg);
       } else {
         OffAccum = NewArg;
       }
     }
     Constant *NewConstOff = CE->getIntegerValue(OffTy, NewConstOffVal);
     if (OffAccum)
-      OffAccum = ConstantExpr::getAdd(OffAccum, NewConstOff,
-                                      /*hasNUW=*/InBounds, /*hasNSW=*/InBounds);
+      OffAccum = ConstantExpr::getAdd(OffAccum, NewConstOff);
     else
       OffAccum = NewConstOff;
     bool HasNonNegativeOff = false;