Disentangle assembler from isolate.

src/debug/arm64/debug-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/debug/debug.h"
 
 #include "src/arm64/frames-arm64.h"
 #include "src/arm64/macro-assembler-arm64-inl.h"
@@ skipping 21 matching lines @@
 void DebugCodegen::GenerateSlot(MacroAssembler* masm, RelocInfo::Mode mode) {
   // Generate enough nop's to make space for a call instruction. Avoid emitting
   // the constant pool in the debug break slot code.
   InstructionAccurateScope scope(masm, Assembler::kDebugBreakSlotInstructions);
   masm->RecordDebugBreakSlot(mode);
   EmitDebugBreakSlot(masm);
 }
 
 
 void DebugCodegen::ClearDebugBreakSlot(Isolate* isolate, Address pc) {
-  PatchingAssembler patcher(isolate, reinterpret_cast<Instruction*>(pc),
+  PatchingAssembler patcher(isolate, pc,
                             Assembler::kDebugBreakSlotInstructions);
   EmitDebugBreakSlot(&patcher);
 }
 
 
 void DebugCodegen::PatchDebugBreakSlot(Isolate* isolate, Address pc,
                                        Handle<Code> code) {
   DCHECK(code->is_debug_stub());
-  PatchingAssembler patcher(isolate, reinterpret_cast<Instruction*>(pc),
+  PatchingAssembler patcher(isolate, pc,
                             Assembler::kDebugBreakSlotInstructions);
   // Patch the code emitted by DebugCodegen::GenerateSlots, changing the debug
   // break slot code from
   //   mov x0, x0    @ nop DEBUG_BREAK_NOP
   //   mov x0, x0    @ nop DEBUG_BREAK_NOP
   //   mov x0, x0    @ nop DEBUG_BREAK_NOP
   //   mov x0, x0    @ nop DEBUG_BREAK_NOP
   //   mov x0, x0    @ nop DEBUG_BREAK_NOP
   // to a call to the debug slot code.
   //   ldr ip0, [pc, #(2 * kInstructionSize)]
@@ skipping 96 matching lines @@
                     CheckDebugStepCallWrapper());
 }
 
 
 const bool LiveEdit::kFrameDropperSupported = true;
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64