[clang-tools-extra] [clang-tidy] Add a new check 'performance-string-view-conversions' (PR #174288)

[Zinovy Nis via cfe-commits]

irishrover wrote:

> LLVM Buildbot has detected a new failure on builder `clang-ppc64le-linux-test-suite` running on `ppc64le-clang-test-suite` while building `clang-tools-extra` at step 6 "test-build-unified-tree-check-all".
> 
> Full details are available at: https://lab.llvm.org/buildbot/#/builders/95/builds/19826
> 
> Here is the relevant piece of the build log for the reference
> ```
> Step 6 (test-build-unified-tree-check-all) failure: test (failure)
> ******************** TEST 'SanitizerCommon-msan-powerpc64le-Linux :: Linux/getpwnam_r_invalid_user.cpp' FAILED ********************
> Exit Code: -6
> 
> Command Output (stdout):
> --
> # RUN: at line 2
> /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/./bin/clang  --driver-mode=g++ -gline-tables-only -fsanitize=memory  -m64 -fno-function-sections -funwind-tables  -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-test-suite/clang-ppc64le-test-suite/llvm-project/compiler-rt/test -ldl -O0 -g /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-test-suite/clang-ppc64le-test-suite/llvm-project/compiler-rt/test/sanitizer_common/TestCases/Linux/getpwnam_r_invalid_user.cpp -o /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/msan-powerpc64le-Linux/Linux/Output/getpwnam_r_invalid_user.cpp.tmp &&  /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/msan-powerpc64le-Linux/Linux/Output/getpwnam_r_invalid_user.cpp.tmp
> # executed command: /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/./bin/clang --driver-mode=g++ -gline-tables-only -fsanitize=memory -m64 -fno-function-sections -funwind-tables -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-test-suite/clang-ppc64le-test-suite/llvm-project/compiler-rt/test -ldl -O0 -g /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-test-suite/clang-ppc64le-test-suite/llvm-project/compiler-rt/test/sanitizer_common/TestCases/Linux/getpwnam_r_invalid_user.cpp -o /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/msan-powerpc64le-Linux/Linux/Output/getpwnam_r_invalid_user.cpp.tmp
> # executed command: /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/msan-powerpc64le-Linux/Linux/Output/getpwnam_r_invalid_user.cpp.tmp
> # .---command stderr------------
> # | Result: 110
> # | getpwnam_r_invalid_user.cpp.tmp: /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-test-suite/clang-ppc64le-test-suite/llvm-project/compiler-rt/test/sanitizer_common/TestCases/Linux/getpwnam_r_invalid_user.cpp:19: int main(): Assertion `res == 0 || res == ENOENT' failed.
> # `-----------------------------
> # error: command failed with exit status: -6
> 
> --
> 
> ********************
> ```

Doesn't seem to be relevant to this PR.

https://github.com/llvm/llvm-project/pull/174288