[llvm] [M68k] Use getM68kMCRegisterClass accessor after MCRegisterClasses became relocation-free (PR #206945)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/M68k/AsmParser/M68kAsmParser.cpp --diff_from_common_commit
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``````````diff
diff --git a/llvm/lib/Target/M68k/AsmParser/M68kAsmParser.cpp b/llvm/lib/Target/M68k/AsmParser/M68kAsmParser.cpp
index f67fdf55c..954b515af 100644
--- a/llvm/lib/Target/M68k/AsmParser/M68kAsmParser.cpp
+++ b/llvm/lib/Target/M68k/AsmParser/M68kAsmParser.cpp
@@ -513,7 +513,8 @@ bool M68kOperand::isPCIBD32() const {
          // If InnerReg is NoReg, this is essentially a PCD with larger
          // displacement.
          (!MemOp.InnerReg.isValid() ||
-          getM68kMCRegisterClass(M68k::XR32RegClassID).contains(MemOp.InnerReg));
+          getM68kMCRegisterClass(M68k::XR32RegClassID)
+              .contains(MemOp.InnerReg));
 }
 bool M68kOperand::isPCIBD16() const {
   return isPCIBD() &&

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https://github.com/llvm/llvm-project/pull/206945