[llvm] Reapply "[MC] Use a variant to hold MCCFIInstruction state (NFC)" (PR #170342)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h -- llvm/include/llvm/MC/MCDwarf.h --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/include/llvm/MC/MCDwarf.h b/llvm/include/llvm/MC/MCDwarf.h
index ddfac483c..caf6ab006 100644
--- a/llvm/include/llvm/MC/MCDwarf.h
+++ b/llvm/include/llvm/MC/MCDwarf.h
@@ -542,8 +542,7 @@ public:
     // alternative where the compiler really wants a user-defined default
     // constructor. Once we no longer support GCC7 these constructors can be
     // replaced with default member initializers and aggregate initialization.
-    CommonFields(unsigned Reg,
-                 int64_t Off = 0,
+    CommonFields(unsigned Reg, int64_t Off = 0,
                  unsigned Reg2 = std::numeric_limits<unsigned>::max(),
                  unsigned AddrSpace = 0)
         : Register(Reg), Offset(Off), Register2(Reg2), AddressSpace(AddrSpace) {

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https://github.com/llvm/llvm-project/pull/170342