[clang] [Clang][Driver] Add option to provide path for multilib's YAML config file (PR #109640)

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git-clang-format --diff 8815328b6bf0f8c5088f6df73ad853a5aba159d9 938e8472acb1c35c6b4b840417e9fdd75581a328 --extensions c,h,cpp -- clang/lib/Driver/ToolChains/BareMetal.cpp clang/lib/Driver/ToolChains/BareMetal.h clang/test/Driver/print-multi-selection-flags.c
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Driver/ToolChains/BareMetal.cpp b/clang/lib/Driver/ToolChains/BareMetal.cpp
index ad4bb13d9e..92b52e7924 100644
--- a/clang/lib/Driver/ToolChains/BareMetal.cpp
+++ b/clang/lib/Driver/ToolChains/BareMetal.cpp
@@ -112,8 +112,8 @@ static std::string computeBaseSysRoot(const Driver &D, bool IncludeTriple) {
 
 BareMetal::BareMetal(const Driver &D, const llvm::Triple &Triple,
                      const ArgList &Args)
-    : ToolChain(D, Triple, Args)
-    , SysRoot(computeBaseSysRoot(D, /*IncludeTriple=*/true)) {
+    : ToolChain(D, Triple, Args),
+      SysRoot(computeBaseSysRoot(D, /*IncludeTriple=*/true)) {
   getProgramPaths().push_back(getDriver().Dir);
 
   findMultilibs(D, Triple, Args);
@@ -262,9 +262,7 @@ Tool *BareMetal::buildStaticLibTool() const {
   return new tools::baremetal::StaticLibTool(*this);
 }
 
-std::string BareMetal::computeSysRoot() const {
-  return SysRoot;
-}
+std::string BareMetal::computeSysRoot() const { return SysRoot; }
 
 BareMetal::OrderedMultilibs BareMetal::getOrderedMultilibs() const {
   // Get multilibs in reverse order because they're ordered most-specific last.

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https://github.com/llvm/llvm-project/pull/109640