Apply modernize-use-starts-ends-with on llvm-project (#89140)

Run `modernize-use-starts-ends-with` on llvm-project. Two instances are
flagged, minor readability improvements, extremely minor performance
improvements.

```
python3 clang-tools-extra/clang-tidy/tool/run-clang-tidy.py \
    -clang-tidy-binary="build/bin/clang-tidy" \
    -clang-apply-replacements-binary="build/bin/clang-apply-replacements" \
    -checks="-*,modernize-use-starts-ends-with" \
    -header-filter=".*" \
    -fix -format
```

I am working on some additions to this check, but they don't seem to
flag any additional cases anyway.

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/unittests/Support/VirtualFileSystemTest.cpp b/llvm/unittests/Support/VirtualFileSystemTest.cpp
index e9b4ac3..e9fd967 100644
--- a/llvm/unittests/Support/VirtualFileSystemTest.cpp
+++ b/llvm/unittests/Support/VirtualFileSystemTest.cpp
@@ -101,7 +101,7 @@ public:
     std::map<std::string, vfs::Status>::iterator I;
     std::string Path;
     bool isInPath(StringRef S) {
-      if (Path.size() < S.size() && S.find(Path) == 0) {
+      if (Path.size() < S.size() && S.starts_with(Path)) {
         auto LastSep = S.find_last_of('/');
         if (LastSep == Path.size() || LastSep == Path.size() - 1)
           return true;