[llvm] CodeGen/test: improve a test, regen with UTC (PR #113338)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-x86_64-debian-dylib` running on `gribozavr4` while building `llvm` at step 7 "test-build-unified-tree-check-llvm".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/60/builds/11761

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

```
Step 7 (test-build-unified-tree-check-llvm) failure: test (failure)
******************** TEST 'LLVM :: CodeGen/NVPTX/load-store.ll' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 2: /b/1/llvm-x86_64-debian-dylib/build/bin/llc < /b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/NVPTX/load-store.ll -march=nvptx64 -mcpu=sm_20 | /b/1/llvm-x86_64-debian-dylib/build/bin/FileCheck -check-prefixes=CHECK,SM60 /b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/NVPTX/load-store.ll
+ /b/1/llvm-x86_64-debian-dylib/build/bin/llc -march=nvptx64 -mcpu=sm_20
+ /b/1/llvm-x86_64-debian-dylib/build/bin/FileCheck -check-prefixes=CHECK,SM60 /b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/NVPTX/load-store.ll
/b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/NVPTX/load-store.ll:170:15: error: CHECK-NEXT: expected string not found in input
; CHECK-NEXT: bfe.u32 %r2, %r1, 0, 8;
              ^
<stdin>:133:21: note: scanning from here
 ld.u32 %r1, [%rd1];
                    ^
<stdin>:147:2: note: possible intended match here
 bfe.u32 %r9, %r1, 0, 8;
 ^
/b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/NVPTX/load-store.ll:514:15: error: CHECK-NEXT: expected string not found in input
; CHECK-NEXT: bfe.u32 %r2, %r1, 0, 8;
              ^
<stdin>:424:30: note: scanning from here
 ld.volatile.u32 %r1, [%rd1];
                             ^
<stdin>:438:2: note: possible intended match here
 bfe.u32 %r9, %r1, 0, 8;
 ^
/b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/NVPTX/load-store.ll:1419:15: error: CHECK-NEXT: expected string not found in input
; CHECK-NEXT: bfe.u32 %r2, %r1, 0, 8;
              ^
<stdin>:1095:28: note: scanning from here
 ld.global.u32 %r1, [%rd1];
                           ^
<stdin>:1109:2: note: possible intended match here
 bfe.u32 %r9, %r1, 0, 8;
 ^
/b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/NVPTX/load-store.ll:1744:15: error: CHECK-NEXT: expected string not found in input
; CHECK-NEXT: bfe.u32 %r2, %r1, 0, 8;
              ^
<stdin>:1386:37: note: scanning from here
 ld.volatile.global.u32 %r1, [%rd1];
                                    ^
<stdin>:1400:2: note: possible intended match here
 bfe.u32 %r9, %r1, 0, 8;
 ^
/b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/NVPTX/load-store.ll:2791:15: error: CHECK-NEXT: expected string not found in input
; CHECK-NEXT: bfe.u32 %r2, %r1, 0, 8;
              ^
<stdin>:2057:28: note: scanning from here
 ld.shared.u32 %r1, [%rd1];
                           ^
...

```

</details>

https://github.com/llvm/llvm-project/pull/113338