[llvm] [CVP] Remove Zero-Index GEP (PR #144831)

[Yingwei Zheng via llvm-commits]

================
@@ -0,0 +1,45 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt < %s -passes=correlated-propagation -S | FileCheck %s
+
+define ptr @noop_gep(ptr %ptr, i8 range(i8 0, 1) %index) {
+; CHECK-LABEL: define ptr @noop_gep(
+; CHECK-SAME: ptr [[PTR:%.*]], i8 range(i8 0, 1) [[INDEX:%.*]]) {
+; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i1, ptr [[PTR]], i8 [[INDEX]]
+; CHECK-NEXT:    ret ptr [[PTR]]
+;
+  %gep = getelementptr i1, ptr %ptr, i8 %index
----------------
dtcxzyw wrote:

```suggestion
  %gep = getelementptr i8, ptr %ptr, i64 %index
```
Use i8 as the pointee type and i64 as the index type.


https://github.com/llvm/llvm-project/pull/144831