[llvm] [AMDGPU] add tests for loop definition of bitconvert (PR #133052)

[Matt Arsenault via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+
+; RUN: llc -mtriple=amdgcn -amdgpu-codegenprepare-break-large-phis-threshold=4096 < %s | FileCheck -check-prefix=GCN %s
+; RUN: llc -mtriple=amdgcn -mcpu=tonga -amdgpu-codegenprepare-break-large-phis-threshold=4096 < %s | FileCheck -check-prefixes=VI %s
+; RUN: llc -mtriple=amdgcn -mcpu=gfx900 -amdgpu-codegenprepare-break-large-phis-threshold=4096 < %s | FileCheck -check-prefixes=GFX9 %s
+; RUN: llc -mtriple=amdgcn -mcpu=gfx1100 -amdgpu-codegenprepare-break-large-phis-threshold=4096 < %s | FileCheck -check-prefixes=GFX11 %s
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arsenm wrote:

can you avoid adding special flags 

https://github.com/llvm/llvm-project/pull/133052