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

src/arm/assembler-arm.cc

Index: src/arm/assembler-arm.cc
diff --git a/src/arm/assembler-arm.cc b/src/arm/assembler-arm.cc
index 05b25ae2d7a525194832df5c2832f1f40b9a79ea..b8b1f49cbaaab2ac68df94942c16a3cebc7d55f4 100644
--- a/src/arm/assembler-arm.cc
+++ b/src/arm/assembler-arm.cc
@@ -3184,6 +3184,14 @@ void Assembler::dd(uint32_t data) {
 }
 
 
+void Assembler::emit_code_stub_address(Code* stub) {
+  CheckBuffer();
+  *reinterpret_cast<uint32_t*>(pc_) =
+      reinterpret_cast<uint32_t>(stub->instruction_start());
+  pc_ += sizeof(uint32_t);
+}
+
+
 void Assembler::RecordRelocInfo(RelocInfo::Mode rmode, intptr_t data,
                                 UseConstantPoolMode mode) {
   // We do not try to reuse pool constants.