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

src/ia32/full-codegen-ia32.cc

Index: src/ia32/full-codegen-ia32.cc
diff --git a/src/ia32/full-codegen-ia32.cc b/src/ia32/full-codegen-ia32.cc
index d284f53ed603bbb696bdb0be0537b8f796c1b5ca..1b657c6e97fe6921c149b348afb65955edd2b636 100644
--- a/src/ia32/full-codegen-ia32.cc
+++ b/src/ia32/full-codegen-ia32.cc
@@ -158,10 +158,25 @@ void FullCodeGenerator::Generate() {
   FrameScope frame_scope(masm_, StackFrame::MANUAL);
 
   info->set_prologue_offset(masm_->pc_offset());
-  __ push(ebp);  // Caller's frame pointer.
-  __ mov(ebp, esp);
-  __ push(esi);  // Callee's context.
-  __ push(edi);  // Callee's JS Function.
+  {
+    PredictableCodeSizeScope predictible_code_size_scope(
+        masm_, kNoCodeAgeSequenceLength);
+    if (FLAG_optimize_for_size && FLAG_age_code) {
+        // Pre-age the code.
+      __ call(isolate()->builtins()->MarkCodeAsExecutedOnce(),
+             RelocInfo::CODE_AGE_SEQUENCE);
+      for (int i = Assembler::kCallInstructionLength;
+           i < kNoCodeAgeSequenceLength;
+           i++) {
+        __ nop();

[danno, 2013/10/04 16:30:09]

Use __ Nop(padding_size) here, lithium and on x64.

[rmcilroy, 2013/10/07 10:56:13]

Done.  Also cleaned up codegen::PatchCodeAge.

+      }
+    } else {
+      __ push(ebp);  // Caller's frame pointer.
+      __ mov(ebp, esp);
+      __ push(esi);  // Callee's context.
+      __ push(edi);  // Callee's JS Function.
+    }
+  }
   info->AddNoFrameRange(0, masm_->pc_offset());
 
   { Comment cmnt(masm_, "[ Allocate locals");