[clang] [clang] [MinGW] Don't look for a GCC in path if the install base has a proper mingw sysroot (PR #76949)

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``````````bash
git-clang-format --diff 71b3ead870107e39e998f6480e545eb01d9d28be 355e2530e855249adf9657c58d4e1a6727d969bd -- clang/lib/Driver/ToolChains/MinGW.cpp clang/test/Driver/mingw-sysroot.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Driver/ToolChains/MinGW.cpp b/clang/lib/Driver/ToolChains/MinGW.cpp
index 3868657659..e2965a08a0 100644
--- a/clang/lib/Driver/ToolChains/MinGW.cpp
+++ b/clang/lib/Driver/ToolChains/MinGW.cpp
@@ -486,8 +486,8 @@ toolchains::MinGW::MinGW(const Driver &D, const llvm::Triple &Triple,
       RocmInstallation(D, Triple, Args) {
   getProgramPaths().push_back(getDriver().getInstalledDir());
 
-  std::string InstallBase = std::string(
-        llvm::sys::path::parent_path(getDriver().getInstalledDir()));
+  std::string InstallBase =
+      std::string(llvm::sys::path::parent_path(getDriver().getInstalledDir()));
   // The sequence for detecting a sysroot here should be kept in sync with
   // the testTriple function below.
   llvm::Triple LiteralTriple = getLiteralTriple(D, getTriple());

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https://github.com/llvm/llvm-project/pull/76949