[llvm] [AMDGPU][LTO] Assume closed world after linking (PR #105845)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-sie-win` running on `sie-win-worker` while building `llvm` at step 7 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/46/builds/3813

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>
```
Step 7 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM :: LTO/AMDGPU/gpu-rdc-amdgpu-attrs.ll' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 1
z:\b\llvm-clang-x86_64-sie-win\build\bin\opt.exe -O3 -debug-only=amdgpu-attributor -S -o - Z:\b\llvm-clang-x86_64-sie-win\llvm-project\llvm\test\LTO\AMDGPU\gpu-rdc-amdgpu-attrs.ll 2>&1 | z:\b\llvm-clang-x86_64-sie-win\build\bin\filecheck.exe Z:\b\llvm-clang-x86_64-sie-win\llvm-project\llvm\test\LTO\AMDGPU\gpu-rdc-amdgpu-attrs.ll --check-prefix=PRE-LINK
# executed command: 'z:\b\llvm-clang-x86_64-sie-win\build\bin\opt.exe' -O3 -debug-only=amdgpu-attributor -S -o - 'Z:\b\llvm-clang-x86_64-sie-win\llvm-project\llvm\test\LTO\AMDGPU\gpu-rdc-amdgpu-attrs.ll'
# executed command: 'z:\b\llvm-clang-x86_64-sie-win\build\bin\filecheck.exe' 'Z:\b\llvm-clang-x86_64-sie-win\llvm-project\llvm\test\LTO\AMDGPU\gpu-rdc-amdgpu-attrs.ll' --check-prefix=PRE-LINK
# .---command stderr------------
# | Z:\b\llvm-clang-x86_64-sie-win\llvm-project\llvm\test\LTO\AMDGPU\gpu-rdc-amdgpu-attrs.ll:6:13: error: PRE-LINK: expected string not found in input
# | ; PRE-LINK: Module {{.*}} is not assumed to be a closed world.
# |             ^
# | <stdin>:1:1: note: scanning from here
# | z:\b\llvm-clang-x86_64-sie-win\build\bin\opt.exe: warning: failed to infer data layout: unable to get target for 'amdgcn-amd-amdhsa', see --version and --triple.
# | ^
# | <stdin>:1:67: note: possible intended match here
# | z:\b\llvm-clang-x86_64-sie-win\build\bin\opt.exe: warning: failed to infer data layout: unable to get target for 'amdgcn-amd-amdhsa', see --version and --triple.
# |                                                                   ^
# | 
# | Input file: <stdin>
# | Check file: Z:\b\llvm-clang-x86_64-sie-win\llvm-project\llvm\test\LTO\AMDGPU\gpu-rdc-amdgpu-attrs.ll
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |            1: z:\b\llvm-clang-x86_64-sie-win\build\bin\opt.exe: warning: failed to infer data layout: unable to get target for 'amdgcn-amd-amdhsa', see --version and --triple. 
# | check:6'0     X~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found
# | check:6'1                                                                       ?                                                                                                possible intended match
# |            2: z:\b\llvm-clang-x86_64-sie-win\build\bin\opt.exe: WARNING: failed to create target machine for 'amdgcn-amd-amdhsa': unable to get target for 'amdgcn-amd-amdhsa', see --version and --triple. 
# | check:6'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |            3: ; ModuleID = 'Z:\b\llvm-clang-x86_64-sie-win\llvm-project\llvm\test\LTO\AMDGPU\gpu-rdc-amdgpu-attrs.ll' 
# | check:6'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |            4: source_filename = "Z:\\b\\llvm-clang-x86_64-sie-win\\llvm-project\\llvm\\test\\LTO\\AMDGPU\\gpu-rdc-amdgpu-attrs.ll" 
# | check:6'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |            5: target triple = "amdgcn-amd-amdhsa" 
# | check:6'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |            6:  
# | check:6'0     ~
# |            7: ; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) 
# | check:6'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |            8: define hidden noundef i32 @_Z3foov() local_unnamed_addr #0 { 
# | check:6'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |            9:  ret i32 1 
# | check:6'0     ~~~~~~~~~~~
# |           10: } 
# | check:6'0     ~~
# |           11:  
# | check:6'0     ~
...

```
</details>

https://github.com/llvm/llvm-project/pull/105845