[LV] Add test case to scalarize ptrtoint instructions.

Extra test for #69013

Author: fhahn

llvm/test/Transforms/LoopVectorize/interleave-and-scalarize-only.ll

@@ -267,3 +267,43 @@ exit:
   %count.0 = trunc i32 %add.lcssa to i16
   ret i16 %count.0
 }
+
+define void @scalarize_ptrtoint(ptr %src, ptr %dst) {
+; CHECK:       vector.body:
+; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %vector.ph ], [ [[INDEX_NEXT:%.*]], %vector.body ]
+; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[INDEX]], 0
+; CHECK-NEXT:    [[TMP1:%.*]] = add i64 [[INDEX]], 1
+; CHECK-NEXT:    [[TMP2:%.*]] = getelementptr ptr, ptr %src, i64 [[TMP0]]
+; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr ptr, ptr %src, i64 [[TMP1]]
+; CHECK-NEXT:    [[TMP4:%.*]] = load ptr, ptr [[TMP2]], align 8
+; CHECK-NEXT:    [[TMP5:%.*]] = load ptr, ptr [[TMP3]], align 8
+; CHECK-NEXT:    [[TMP6:%.*]] = ptrtoint ptr [[TMP4]] to i64
+; CHECK-NEXT:    [[TMP7:%.*]] = ptrtoint ptr [[TMP5]] to i64
+; CHECK-NEXT:    [[TMP8:%.*]] = add i64 [[TMP6]], 10
+; CHECK-NEXT:    [[TMP9:%.*]] = add i64 [[TMP7]], 10
+; CHECK-NEXT:    [[TMP10:%.*]] = inttoptr i64 [[TMP8]] to ptr
+; CHECK-NEXT:    [[TMP11:%.*]] = inttoptr i64 [[TMP9]] to ptr
+; CHECK-NEXT:    store ptr [[TMP10]], ptr %dst, align 8
+; CHECK-NEXT:    store ptr [[TMP11]], ptr %dst, align 8
+; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 2
+; CHECK-NEXT:    [[TMP12:%.*]] = icmp eq i64 [[INDEX_NEXT]], 0
+; CHECK-NEXT:    br i1 [[TMP12]], label %middle.block, label %vector.body
+
+entry:
+  br label %loop
+
+loop:
+  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
+  %gep = getelementptr ptr, ptr %src, i64 %iv
+  %l = load ptr, ptr %gep, align 8
+  %cast = ptrtoint ptr %l to i64
+  %add = add i64 %cast, 10
+  %cast.2 = inttoptr i64 %add to ptr
+  store ptr %cast.2, ptr %dst, align 8
+  %iv.next = add i64 %iv, 1
+  %ec = icmp eq i64 %iv.next, 0
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}