Moved buffer handling to AssemblerBase.

src/arm/assembler-arm.h

Index: src/arm/assembler-arm.h
diff --git a/src/arm/assembler-arm.h b/src/arm/assembler-arm.h
index bc12480e9bf2d6d8bec038310c87b9bac440e5d8..3b9bb804fd331c144563d6522239c6967933a817 100644
--- a/src/arm/assembler-arm.h
+++ b/src/arm/assembler-arm.h
@@ -647,7 +647,7 @@ class Assembler : public AssemblerBase {
   // is too small, a fatal error occurs. No deallocation of the buffer is done
   // upon destruction of the assembler.
   Assembler(Isolate* isolate, void* buffer, int buffer_size);
-  ~Assembler();
+  virtual ~Assembler();
 
   // GetCode emits any pending (non-emitted) code and fills the descriptor
   // desc. GetCode() is idempotent; it returns the same result if no other
@@ -1276,8 +1276,6 @@ class Assembler : public AssemblerBase {
   void db(uint8_t data);
   void dd(uint32_t data);
 
-  int pc_offset() const { return pc_ - buffer_; }
-
   PositionsRecorder* positions_recorder() { return &positions_recorder_; }
 
   // Read/patch instructions
@@ -1380,13 +1378,6 @@ class Assembler : public AssemblerBase {
   }
 
  private:
-  // Code buffer:
-  // The buffer into which code and relocation info are generated.
-  byte* buffer_;
-  int buffer_size_;
-  // True if the assembler owns the buffer, false if buffer is external.
-  bool own_buffer_;
-
   int next_buffer_check_;  // pc offset of next buffer check
 
   // Code generation
@@ -1395,7 +1386,6 @@ class Assembler : public AssemblerBase {
   // not have to check for overflow. The same is true for writes of large
   // relocation info entries.
   static const int kGap = 32;
-  byte* pc_;  // the program counter; moves forward
 
   // Constant pool generation
   // Pools are emitted in the instruction stream, preferably after unconditional