[llvm] [clang] [IR] Fix GEP offset computations for vector GEPs (PR #75448)

[Jannik Silvanus via cfe-commits]

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@@ -111,6 +111,20 @@ define void @test_evaluate_gep_as_ptrs_array(ptr addrspace(2) %B) {
   ret void
 }
 
+define void @test_overaligned_vec(i8 %B) {
+        ; This should be turned into a constexpr instead of being an instruction
+; CHECK-LABEL: @test_overaligned_vec(
+; TODO: In this test case, half is overaligned to 32 bits.
+;       Vectors are bit-packed and don't respect alignment.
+;       Thus, the byte offset of the second half in <2 x half> is 2 bytes, not 4 bytes:
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jasilvanus wrote:

Thanks, I moved the first comment away. The TODO is already removed in the main commit of this PR.

https://github.com/llvm/llvm-project/pull/75448