Avoid using dd() in Prologue when --optimize-for-size.

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 8caa64df34c2ce442b4919122c45b531dd06c864..0437b3fb207463349ea00312256489573d028be8 100644
--- a/src/arm/assembler-arm.h
+++ b/src/arm/assembler-arm.h
@@ -1393,6 +1393,9 @@ class Assembler : public AssemblerBase {
   void db(uint8_t data);
   void dd(uint32_t data);
 
+  // Emits the address of the code stub's first instruction.
+  void emit_code_stub_address(Code* stub);
+
   PositionsRecorder* positions_recorder() { return &positions_recorder_; }
 
   // Read/patch instructions