[clang] Driver: Accept the --gcc-install-dir option multiple times (PR #71446)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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``````````bash
git-clang-format --diff bc7a3bd864be696217c4d11eddf16bed7646b60f 2474aad8585829936af66d8b1238a1876c0f8327 -- clang/lib/Driver/ToolChains/Gnu.cpp clang/test/Driver/gcc-install-dir.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Driver/ToolChains/Gnu.cpp b/clang/lib/Driver/ToolChains/Gnu.cpp
index 64645cd03b6f..ba5a3b4f6b5d 100644
--- a/clang/lib/Driver/ToolChains/Gnu.cpp
+++ b/clang/lib/Driver/ToolChains/Gnu.cpp
@@ -2127,7 +2127,8 @@ void Generic_GCC::GCCInstallationDetector::init(
 
   // If --gcc-install-dir= is specified, skip filesystem detection.
   std::vector<std::string> FailedGCCInstallDirs;
-  std::vector<std::string> GCCInstallDirs = Args.getAllArgValues(clang::driver::options::OPT_gcc_install_dir_EQ);
+  std::vector<std::string> GCCInstallDirs =
+      Args.getAllArgValues(clang::driver::options::OPT_gcc_install_dir_EQ);
   for (auto it = GCCInstallDirs.rbegin(); it != GCCInstallDirs.rend(); ++it) {
     StringRef InstallDir = *it;
     if (!ScanGCCForMultilibs(TargetTriple, Args, InstallDir, false)) {
@@ -2155,7 +2156,6 @@ void Generic_GCC::GCCInstallationDetector::init(
   if (!FailedGCCInstallDirs.empty())
     return;
 
-
   // Compute the set of prefixes for our search.
   SmallVector<std::string, 8> Prefixes;
   StringRef GCCToolchainDir = getGCCToolchainDir(Args, D.SysRoot);

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https://github.com/llvm/llvm-project/pull/71446