[M68k] Pass optLevel to InstructionSelect

This makes it the same as every other in-tree target.

Reviewers: arsenm, mshockwave

Pull Request: llvm/llvm-project#217930

Author: boomanaiden154

llvm/lib/Target/M68k/M68kTargetMachine.cpp

@@ -159,7 +159,7 @@ bool M68kPassConfig::addRegBankSelect() {
 }
 
 bool M68kPassConfig::addGlobalInstructionSelect() {
-  addPass(new InstructionSelect());
+  addPass(new InstructionSelect(getOptLevel()));
   return false;
 }