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

src/ia32/lithium-codegen-ia32.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 188 matching lines @@
       __ j(not_zero, &align_loop, Label::kNear);
       __ mov(Operand(ebx, 0), Immediate(kAlignmentZapValue));
       __ bind(&do_not_pad);
     }
   }
 
   info()->set_prologue_offset(masm_->pc_offset());
   if (NeedsEagerFrame()) {
     ASSERT(!frame_is_built_);
     frame_is_built_ = true;
-    __ push(ebp);  // Caller's frame pointer.
-    __ mov(ebp, esp);
-    info()->AddNoFrameRange(0, masm_->pc_offset());
-    __ push(esi);  // Callee's context.
-    if (info()->IsStub()) {
-      __ push(Immediate(Smi::FromInt(StackFrame::STUB)));
+    if (FLAG_optimize_for_size && FLAG_age_code && !info()->IsStub()) {
+        // Pre-age the code.
+      __ call(isolate()->builtins()->MarkCodeAsExecutedOnce(),
+             RelocInfo::CODE_AGE_SEQUENCE);
+      for (int i = Assembler::kCallInstructionLength;
+           i < kNoCodeAgeSequenceLength;
+           i++) {
+        __ nop();
+      }
     } else {
-      __ push(edi);  // Callee's JS function.
+      __ push(ebp);  // Caller's frame pointer.
+      __ mov(ebp, esp);
+      info()->AddNoFrameRange(0, masm_->pc_offset());
+      __ push(esi);  // Callee's context.
+      if (info()->IsStub()) {
+        __ push(Immediate(Smi::FromInt(StackFrame::STUB)));
+      } else {
+        __ push(edi);  // Callee's JS function.
+      }
     }
   }
 
   if (info()->IsOptimizing() &&
       dynamic_frame_alignment_ &&
       FLAG_debug_code) {
     __ test(esp, Immediate(kPointerSize));
     __ Assert(zero, kFrameIsExpectedToBeAligned);
   }
 
@@ skipping 6176 matching lines @@
                               FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32