[clang] [clang] Expose MC target options through -mllvm (PR #210087)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,c -- clang/test/CodeGen/mllvm-mc-target-options.c clang/lib/CodeGen/BackendUtil.cpp clang/tools/driver/cc1as_main.cpp --diff_from_common_commit
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``````````diff
diff --git a/clang/tools/driver/cc1as_main.cpp b/clang/tools/driver/cc1as_main.cpp
index 0792a37b2..f034c3b53 100644
--- a/clang/tools/driver/cc1as_main.cpp
+++ b/clang/tools/driver/cc1as_main.cpp
@@ -471,10 +471,10 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
   assert(MRI && "Unable to create target register info!");
 
   // Seed the MC layer with any machine-code options supplied via -mllvm (for
-  // example -large-eh-encoding). The cc1as flag-derived settings below overwrite
-  // whatever they cover, so -mllvm only contributes MC options that have no
-  // dedicated cc1as flag. Absent any -mllvm flags this is equivalent to a
-  // default-constructed MCTargetOptions.
+  // example -large-eh-encoding). The cc1as flag-derived settings below
+  // overwrite whatever they cover, so -mllvm only contributes MC options that
+  // have no dedicated cc1as flag. Absent any -mllvm flags this is equivalent to
+  // a default-constructed MCTargetOptions.
   MCTargetOptions MCOptions = mc::InitMCTargetOptionsFromFlags();
   MCOptions.MCRelaxAll = Opts.RelaxAll;
   MCOptions.EmitDwarfUnwind = Opts.EmitDwarfUnwind;

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https://github.com/llvm/llvm-project/pull/210087