ARM: Support record write stubs for incremental marking.

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 97d4226503b21e56e8881632ed8736a900ac1166..67a1f7301c8db11fc3c68078f607afa67200e7ca 100644
--- a/src/arm/assembler-arm.h
+++ b/src/arm/assembler-arm.h
@@ -1206,6 +1206,10 @@ class Assembler : public AssemblerBase {
   PositionsRecorder* positions_recorder() { return &positions_recorder_; }
 
   // Read/patch instructions
+  Instr instr_at(int pos) { return *reinterpret_cast<Instr*>(buffer_ + pos); }
+  void instr_at_put(int pos, Instr instr) {
+    *reinterpret_cast<Instr*>(buffer_ + pos) = instr;
+  }
   static Instr instr_at(byte* pc) { return *reinterpret_cast<Instr*>(pc); }
   static void instr_at_put(byte* pc, Instr instr) {
     *reinterpret_cast<Instr*>(pc) = instr;
@@ -1260,12 +1264,6 @@ class Assembler : public AssemblerBase {
 
   int buffer_space() const { return reloc_info_writer.pos() - pc_; }
 
-  // Read/patch instructions
-  Instr instr_at(int pos) { return *reinterpret_cast<Instr*>(buffer_ + pos); }
-  void instr_at_put(int pos, Instr instr) {
-    *reinterpret_cast<Instr*>(buffer_ + pos) = instr;
-  }
-
   // Decode branch instruction at pos and return branch target pos
   int target_at(int pos);