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

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-m68k

Author: Sylvestre Ledru (sylvestre)

<details>
<summary>Changes</summary>



Regressed by 0b413b7d0f5a, #<!-- -->206753


Issue:

```
  /build/source/llvm/lib/Target/M68k/AsmParser/M68kAsmParser.cpp: In member function 'bool
  {anonymous}::M68kOperand::isPCIBD32() const':
  /build/source/llvm/lib/Target/M68k/AsmParser/M68kAsmParser.cpp:516:11: error:
  'M68kMCRegisterClasses' was not declared in this scope
    516 |           M68kMCRegisterClasses[M68k::XR32RegClassID].contains(MemOp.InnerReg));
        |           ^~~~~~~~~~~~~~~~~~~~~
```

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


1 Files Affected:

- (modified) llvm/lib/Target/M68k/AsmParser/M68kAsmParser.cpp (+2-2) 


``````````diff
diff --git a/llvm/lib/Target/M68k/AsmParser/M68kAsmParser.cpp b/llvm/lib/Target/M68k/AsmParser/M68kAsmParser.cpp
index ee19a7f058f94..f67fdf55c7fdb 100644
--- a/llvm/lib/Target/M68k/AsmParser/M68kAsmParser.cpp
+++ b/llvm/lib/Target/M68k/AsmParser/M68kAsmParser.cpp
@@ -513,11 +513,11 @@ bool M68kOperand::isPCIBD32() const {
          // If InnerReg is NoReg, this is essentially a PCD with larger
          // displacement.
          (!MemOp.InnerReg.isValid() ||
-          M68kMCRegisterClasses[M68k::XR32RegClassID].contains(MemOp.InnerReg));
+          getM68kMCRegisterClass(M68k::XR32RegClassID).contains(MemOp.InnerReg));
 }
 bool M68kOperand::isPCIBD16() const {
   return isPCIBD() &&
-         M68kMCRegisterClasses[M68k::XR16RegClassID].contains(MemOp.InnerReg);
+         getM68kMCRegisterClass(M68k::XR16RegClassID).contains(MemOp.InnerReg);
 }
 void M68kOperand::addPCIBDOperands(MCInst &Inst, unsigned N) const {
   M68kOperand::addExpr(Inst, MemOp.OuterDisp);

``````````

</details>


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