[llvm] [AMDGCN] Use ZExt when handling indices in insertment element (PR #85718)

[Peter Rong via llvm-commits]

================
@@ -0,0 +1,24 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 4
+;RUN: llc -mtriple=amdgcn -mcpu=gfx1036 < %s | FileCheck %s
+define void @test(i1 %Bool, ptr %Ptr, <32 x float> %Vec1, <32 x float> %Vec2) {
----------------
DataCorrupted wrote:

Moved to `test/CodeGen/AMDGPU/amdgpu-codegenprepare-break-large-phis.ll` and adapted to size-four-vector to avoid excessive `OPT-NEXT`. Please check if the test is desirable.

https://github.com/llvm/llvm-project/pull/85718