[llvm] [AMDGPU] Add insert/extract element test for v4i32 (PR #79384)

[Matt Arsenault via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 4
+; RUN: llc -mtriple=amdgcn--amdhsa -mcpu=gfx90a -verify-machineinstrs < %s | FileCheck -check-prefixes=GFX90a %s
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arsenm wrote:

No, march names are canonically all lowercase 

https://github.com/llvm/llvm-project/pull/79384