[clang-tools-extra] [clang-tidy] Add `llvm-formatv-string` (PR #195974)

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github-actions[bot] wrote:

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

The build failed before running any tests. Click on a failure below to see the details.

<details>
<summary>[code=1] tools/clang/tools/extra/clang-tidy/llvm/CMakeFiles/obj.clangTidyLLVMModule.dir/FormatvStringCheck.cpp.obj</summary>

```
FAILED: [code=1] tools/clang/tools/extra/clang-tidy/llvm/CMakeFiles/obj.clangTidyLLVMModule.dir/FormatvStringCheck.cpp.obj
sccache C:\clang\clang-msvc\bin\clang-cl.exe  /nologo -TP -DCLANG_BUILD_STATIC -DUNICODE -D_CRT_NONSTDC_NO_DEPRECATE -D_CRT_NONSTDC_NO_WARNINGS -D_CRT_SECURE_NO_DEPRECATE -D_CRT_SECURE_NO_WARNINGS -D_GLIBCXX_ASSERTIONS -D_HAS_EXCEPTIONS=0 -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_EXTENSIVE -D_SCL_SECURE_NO_DEPRECATE -D_SCL_SECURE_NO_WARNINGS -D_UNICODE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -IC:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\clang-tidy\llvm -IC:\_work\llvm-project\llvm-project\clang-tools-extra\clang-tidy\llvm -IC:\_work\llvm-project\llvm-project\build\tools\clang\tools\extra\clang-tidy -IC:\_work\llvm-project\llvm-project\clang\include -IC:\_work\llvm-project\llvm-project\build\tools\clang\include -IC:\_work\llvm-project\llvm-project\build\include -IC:\_work\llvm-project\llvm-project\llvm\include /DWIN32 /D_WINDOWS   /Zc:inline /Zc:__cplusplus /Oi /Brepro /bigobj /permissive- -Werror=unguarded-availability-new /W4  -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported /Gw /O2 /Ob2  -std:c++17 -MD -UNDEBUG /EHs-c- /GR- /showIncludes /Fotools\clang\tools\extra\clang-tidy\llvm\CMakeFiles\obj.clangTidyLLVMModule.dir\FormatvStringCheck.cpp.obj /Fdtools\clang\tools\extra\clang-tidy\llvm\CMakeFiles\obj.clangTidyLLVMModule.dir\ -c -- C:\_work\llvm-project\llvm-project\clang-tools-extra\clang-tidy\llvm\FormatvStringCheck.cpp
C:\_work\llvm-project\llvm-project\clang-tools-extra\clang-tidy\llvm\FormatvStringCheck.cpp(176,7): error: use of undeclared identifier 'UsedIndices'; did you mean 'UnusedIndices'?
176 |       UsedIndices.reset(Index);
|       ^~~~~~~~~~~
|       UnusedIndices
C:\_work\llvm-project\llvm-project\clang-tools-extra\clang-tidy\llvm\FormatvStringCheck.cpp(174,26): note: 'UnusedIndices' declared here
174 |     llvm::SmallBitVector UnusedIndices(NumRequiredArgs, true);
|                          ^
1 error generated.
```
</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/195974