[llvm] [AMDGPU] Change isSingleLaneExecution to account for WWM enabling lanes even if there's only one workitem (PR #188316)

[Matt Arsenault via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-attributes --check-globals all --version 5
+; Test the generation of the attribute amdgpu-no-wwm
+; RUN: opt -S -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -passes=amdgpu-attributor < %s | FileCheck -check-prefixes=GFX9 %s
+; RUN: opt -S -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1010 -passes=amdgpu-attributor < %s | FileCheck -check-prefixes=GFX10 %s
+; RUN: opt -S -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1100 -passes=amdgpu-attributor < %s | FileCheck -check-prefixes=GFX11 %s
+; RUN: opt -S -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1200 -passes=amdgpu-attributor < %s | FileCheck -check-prefixes=GFX12 %s
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arsenm wrote:

Not subtarget dependent, don't need all of these 

https://github.com/llvm/llvm-project/pull/188316