[llvm] [AMDGPU] Make `getAssumedAddrSpace` return AS1 for pointer kernel arguments (PR #137488)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-sie-ubuntu-fast` running on `sie-linux-worker` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/144/builds/26513

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM :: Transforms/OpenMP/spmdization_guarding.ll' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/bin/opt -S -passes=openmp-opt < /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/llvm/test/Transforms/OpenMP/spmdization_guarding.ll | /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/bin/FileCheck /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/llvm/test/Transforms/OpenMP/spmdization_guarding.ll # RUN: at line 2
+ /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/bin/opt -S -passes=openmp-opt
+ /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/bin/FileCheck /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/llvm/test/Transforms/OpenMP/spmdization_guarding.ll
/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/bin/opt: WARNING: failed to create target machine for 'nvptx64': unable to get target for 'nvptx64', see --version and --triple.
/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/llvm/test/Transforms/OpenMP/spmdization_guarding.ll:88:15: error: CHECK-NEXT: expected string not found in input
; CHECK-NEXT: [[TMP4:%.*]] = addrspacecast ptr [[ARRAYIDX1_I]] to ptr addrspace(1)
              ^
<stdin>:44:43: note: scanning from here
 store i32 0, ptr %x, align 4, !noalias !7
                                          ^
<stdin>:44:43: note: with "ARRAYIDX1_I" equal to "%arrayidx1\\.i"
 store i32 0, ptr %x, align 4, !noalias !7
                                          ^
<stdin>:62:23: note: possible intended match here
 %sub.i = add nsw i32 %N.addr.sroa.0.0.extract.trunc, -1
                      ^
/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/llvm/test/Transforms/OpenMP/spmdization_guarding.ll:444:24: error: undefined variable: ATTR9
; CHECK: attributes #[[ATTR9]] = { nounwind willreturn "llvm.assume"="omp_no_openmp,ompx_spmd_amenable" }
                       ^
<stdin>:226:1: note: possible intended match here
attributes #9 = { nounwind willreturn "llvm.assume"="omp_no_openmp,ompx_spmd_amenable" }
^

Input file: <stdin>
Check file: /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/llvm/test/Transforms/OpenMP/spmdization_guarding.ll

-dump-input=help explains the following input dump.

Input was:
<<<<<<
             1: ; ModuleID = '<stdin>' 
             2: source_filename = "<stdin>" 
             3: target datalayout = "e-i64:64-i128:128-v16:16-v32:32-n16:32:64" 
             4: target triple = "nvptx64" 
             5:  
             6: %struct.ident_t = type { i32, i32, i32, i32, ptr } 
             7: %struct.KernelEnvironmentTy = type { %struct.ConfigurationEnvironmentTy, ptr, ptr } 
             8: %struct.ConfigurationEnvironmentTy = type { i8, i8, i8, i32, i32, i32, i32, i32, i32 } 
             9:  
            10:  at 0 = private unnamed_addr constant [23 x i8] c";unknown;unknown;0;0;;\00", align 1 
check:49'0      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
check:49'1       ^                                                                                  captured var "GLOB0"
            11:  at 1 = private unnamed_addr constant %struct.ident_t { i32 0, i32 2, i32 0, i32 0, ptr @0 }, align 8 
check:50'0      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
check:50'1                                                                                                          with "GLOB0" equal to "0"
...

```

</details>

https://github.com/llvm/llvm-project/pull/137488