[clang] Update Clang.cpp (PR #77882)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang

@llvm/pr-subscribers-clang-driver

Author: hw-1 (hw-1)

<details>
<summary>Changes</summary>

fix error: .gch' was ignored because it is not a clang PCH file   https://github.com/llvm/llvm-project/issues/76923

---
Full diff: https://github.com/llvm/llvm-project/pull/77882.diff


1 Files Affected:

- (modified) clang/lib/Driver/ToolChains/Clang.cpp (+1-1) 


``````````diff
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 1ee7ae602f3ce5..2c35b9b84ac959 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -951,7 +951,7 @@ static void handleAMDGPUCodeObjectVersionOptions(const Driver &D,
 static bool hasClangPchSignature(const Driver &D, StringRef Path) {
   if (llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> MemBuf =
           D.getVFS().getBufferForFile(Path))
-    return (*MemBuf)->getBuffer().starts_with("CPCH");
+    return (*MemBuf)->getBuffer().contains("CPCH");
   return false;
 }
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/77882