[clang] [clang][HeaderSearch] Treat permission-denied include paths as non-fatal (PR #177582)

[via cfe-commits]

github-actions[bot] wrote:

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

* 52324 tests passed
* 920 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 > C:\_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
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-flags.c.tmp C:\_work\llvm-project\llvm-project\clang\test\Misc\warning-flags.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-flags.c.tmp' 'C:\_work\llvm-project\llvm-project\clang\test\Misc\warning-flags.c'
# .---command stderr------------
# | C:\_work\llvm-project\llvm-project\clang\test\Misc\warning-flags.c:21:8: error: CHECK: expected string not found in input
# | CHECK: Warnings without flags (56):
# |        ^
# | C:\_work\llvm-project\llvm-project\build\tools\clang\test\Misc\Output\warning-flags.c.tmp:1:1: note: scanning from here
# | Warnings with flags (2155):
# | ^
# | 
# | Input file: C:\_work\llvm-project\llvm-project\build\tools\clang\test\Misc\Output\warning-flags.c.tmp
# | Check file: C:\_work\llvm-project\llvm-project\clang\test\Misc\warning-flags.c
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |           1: Warnings with flags (2155): 
# | check:21     X~~~~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found
# |           2:  backslash_newline_space [-Wbackslash-newline-escape] 
# | check:21     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |           3:  compat_cxx11_enum_fixed_underlying_type [-Wc++98-compat] 
# | check:21     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |           4:  compat_cxx11_nonclass_type_friend [-Wc++98-compat] 
# | check:21     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |           5:  compat_cxx11_static_data_member_in_union [-Wc++98-compat] 
# | check:21     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |           6:  compat_cxx11_templ_default_in_function_templ [-Wc++98-compat] 
# | check:21     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |           .
# |           .
# |           .
# | >>>>>>
# `-----------------------------
# 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/177582