Always pass an Isolate to AssemblerBase

src/arm64/code-stubs-arm64.h

Index: src/arm64/code-stubs-arm64.h
diff --git a/src/arm64/code-stubs-arm64.h b/src/arm64/code-stubs-arm64.h
index 341153380dcd6b8d639484f498decf0a699c97d4..4b56b5468f9b976a2794fc6b97b43f33cdda6b3a 100644
--- a/src/arm64/code-stubs-arm64.h
+++ b/src/arm64/code-stubs-arm64.h
@@ -131,6 +131,7 @@ class RecordWriteStub: public PlatformCodeStub {
   static void Patch(Code* stub, Mode mode) {
     // We are going to patch the two first instructions of the stub.
     PatchingAssembler patcher(
+        stub->GetIsolate(),
         reinterpret_cast<Instruction*>(stub->instruction_start()), 2);
     Instruction* instr1 = patcher.InstructionAt(0);
     Instruction* instr2 = patcher.InstructionAt(kInstructionSize);