[clang] [clang][SME] Rework streaming mode always_inline errors/warnings (PR #174608)

[via cfe-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Windows-->
# :window: Windows x64 Test Results

* 51732 tests passed
* 890 tests skipped
* 1 test failed

## Failed Tests
(click on a test name to see its output)

### Clang
<details>
<summary>Clang.Misc/warning-wall.c</summary>

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 1
diagtool tree -Wall > C:\_work\llvm-project\llvm-project\build\tools\clang\test\Misc\Output\warning-wall.c.tmp 2>&1
# executed command: diagtool tree -Wall
# note: command had no output on stdout or stderr
# RUN: at line 2
c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe --input-file=C:\_work\llvm-project\llvm-project\build\tools\clang\test\Misc\Output\warning-wall.c.tmp C:\_work\llvm-project\llvm-project\clang\test\Misc\warning-wall.c
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe' '--input-file=C:\_work\llvm-project\llvm-project\build\tools\clang\test\Misc\Output\warning-wall.c.tmp' 'C:\_work\llvm-project\llvm-project\clang\test\Misc\warning-wall.c'
# .---command stderr------------
# | C:\_work\llvm-project\llvm-project\clang\test\Misc\warning-wall.c:113:11: error: CHECK-NOT: excluded string found in input
# | CHECK-NOT:-W
# |           ^
# | C:\_work\llvm-project\llvm-project\build\tools\clang\test\Misc\Output\warning-wall.c.tmp:114:2: note: found here
# |  -Waarch64-sme-attributes
# |  ^~
# | 
# | Input file: C:\_work\llvm-project\llvm-project\build\tools\clang\test\Misc\Output\warning-wall.c.tmp
# | Check file: C:\_work\llvm-project\llvm-project\clang\test\Misc\warning-wall.c
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |          .
# |          .
# |          .
# |        109:  -Wswitch-bool 
# |        110:  -Wmisleading-indentation 
# |        111:  -Wpacked-non-pod 
# |        112:  -Wvla-cxx-extension 
# |        113:  -Wvla-extension-static-assert 
# |        114:  -Waarch64-sme-attributes 
# | not:113      !~                        error: no match expected
# | >>>>>>
# `-----------------------------
# error: command failed with exit status: 1

--

```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/174608