[llvm] [M68k] Fix build after removal of RegisterClasses pointer array (PR #207364)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/M68k/M68kRegisterInfo.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Target/M68k/M68kRegisterInfo.cpp b/llvm/lib/Target/M68k/M68kRegisterInfo.cpp
index af5e824b3..b9f205ca1 100644
--- a/llvm/lib/Target/M68k/M68kRegisterInfo.cpp
+++ b/llvm/lib/Target/M68k/M68kRegisterInfo.cpp
@@ -90,8 +90,7 @@ M68kRegisterInfo::getMaximalPhysRegClass(unsigned reg, MVT VT) const {
   // this physreg.
   const TargetRegisterClass *BestRC = nullptr;
   for (const TargetRegisterClass &RC : regclasses()) {
-    if ((VT == MVT::Other || isTypeLegalForClass(RC, VT)) &&
-        RC.contains(reg) &&
+    if ((VT == MVT::Other || isTypeLegalForClass(RC, VT)) && RC.contains(reg) &&
         (!BestRC ||
          (BestRC->hasSubClass(&RC) && RC.getNumRegs() > BestRC->getNumRegs())))
       BestRC = &RC;

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https://github.com/llvm/llvm-project/pull/207364