[NFC][AArch64] Fix typo.

Summary: Coaleascer should be coalescer.

Reviewers: qcolombet, Jim

Reviewed By: Jim

Subscribers: Jim, kristof.beyls, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D70731

llvm/lib/Target/AArch64/AArch64TargetMachine.cpp

@@ -572,7 +572,7 @@ void AArch64PassConfig::addPreRegAlloc() {
   if (TM->getOptLevel() != CodeGenOpt::None && EnableAdvSIMDScalar) {
     addPass(createAArch64AdvSIMDScalar());
     // The AdvSIMD pass may produce copies that can be rewritten to
-    // be register coaleascer friendly.
+    // be register coalescer friendly.
     addPass(&PeepholeOptimizerID);
   }
 }