Enable preaging of code objects when --optimize-for-size.

src/arm/lithium-codegen-arm.cc

Index: src/arm/lithium-codegen-arm.cc
diff --git a/src/arm/lithium-codegen-arm.cc b/src/arm/lithium-codegen-arm.cc
index 60e21b7de046cafed97c190f86813263de7dafef..fc7d0fdb6a2ae8fcb166d56e4097f87df7429445 100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -133,21 +133,7 @@ bool LCodeGen::GeneratePrologue() {
 
   info()->set_prologue_offset(masm_->pc_offset());
   if (NeedsEagerFrame()) {
-    if (info()->IsStub()) {
-      __ stm(db_w, sp, cp.bit() | fp.bit() | lr.bit());
-      __ Push(Smi::FromInt(StackFrame::STUB));
-      // Adjust FP to point to saved FP.
-      __ add(fp, sp, Operand(2 * kPointerSize));
-    } else {
-      PredictableCodeSizeScope predictible_code_size_scope(
-          masm_, kNoCodeAgeSequenceLength * Assembler::kInstrSize);
-      // The following three instructions must remain together and unmodified
-      // for code aging to work properly.
-      __ stm(db_w, sp, r1.bit() | cp.bit() | fp.bit() | lr.bit());
-      __ nop(ip.code());
-      // Adjust FP to point to saved FP.
-      __ add(fp, sp, Operand(2 * kPointerSize));
-    }
+    __ Prologue(info()->IsStub() ? BUILD_STUB_FRAME : BUILD_FUNCTION_FRAME);
     frame_is_built_ = true;
     info_->AddNoFrameRange(0, masm_->pc_offset());
   }