[clang] [Clang][Parser] Reject unbalanced unknown attribute arguments (PR #220259)

[via cfe-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Linux-->
# :penguin: Linux x64 Test Results

* 61404 tests passed
* 1859 tests skipped
* 1 test failed

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

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

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 1
diagtool list-warnings > /home/gha/actions-runner/_work/llvm-project/llvm-project/build/tools/clang/test/Misc/Output/warning-flags.c.tmp 2>&1
# executed command: diagtool list-warnings
# note: command had no output on stdout or stderr
# RUN: at line 2
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/FileCheck --input-file=/home/gha/actions-runner/_work/llvm-project/llvm-project/build/tools/clang/test/Misc/Output/warning-flags.c.tmp /home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Misc/warning-flags.c
# executed command: /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/FileCheck --input-file=/home/gha/actions-runner/_work/llvm-project/llvm-project/build/tools/clang/test/Misc/Output/warning-flags.c.tmp /home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Misc/warning-flags.c
# .---command stderr------------
# | /home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Misc/warning-flags.c:82:8: error: CHECK: expected string not found in input
# | CHECK: Number in -Wpedantic (not covered by other -W flags): 24
# |        ^
# | /home/gha/actions-runner/_work/llvm-project/llvm-project/build/tools/clang/test/Misc/Output/warning-flags.c.tmp:2320:18: note: scanning from here
# |  warn_weak_import
# |                  ^
# | /home/gha/actions-runner/_work/llvm-project/llvm-project/build/tools/clang/test/Misc/Output/warning-flags.c.tmp:2327:2: note: possible intended match here
# |  Number in -Wpedantic (not covered by other -W flags): 25
# |  ^
# | 
# | Input file: /home/gha/actions-runner/_work/llvm-project/llvm-project/build/tools/clang/test/Misc/Output/warning-flags.c.tmp
# | Check file: /home/gha/actions-runner/_work/llvm-project/llvm-project/clang/test/Misc/warning-flags.c
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |             .
# |             .
# |             .
# |          2315:  warn_template_export_unsupported 
# |          2316:  warn_undef_interface 
# |          2317:  warn_undef_interface_suggest 
# |          2318:  warn_undef_protocolref 
# |          2319:  warn_weak_identifier_undeclared 
# |          2320:  warn_weak_import 
# | check:82'0                     {   search range start (exclusive)
# | check:82'1                         error: no match found in search range
# |          2321:  
# |          2322: STATISTICS: 
# |          2323:  
# |          2324:  Percentage of warnings with flags: 97.58% 
# |          2325:  Number of unique flags: 1057 
# |          2326:  Average number of diagnostics per flag: 2.14 
# |          2327:  Number in -Wpedantic (not covered by other -W flags): 25 
# | check:82'2      ?                                                          possible intended match
# |          2328:  
# | check:82'3      } search range end (exclusive)
# | >>>>>>
# `-----------------------------
# 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/220259