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 6d39cc1e6e5045bd2f7237e835f2384d37085f1b..3a32a49a42d6fad52f726e3c2df12c76eaf25f96 100644
--- a/src/ia32/full-codegen-ia32.cc
+++ b/src/ia32/full-codegen-ia32.cc
@@ -160,7 +160,15 @@ void FullCodeGenerator::Generate() {
   info->set_prologue_offset(masm_->pc_offset());
   __ push(ebp);  // Caller's frame pointer.
   __ mov(ebp, esp);
-  __ push(esi);  // Callee's context.
+  if (isolate()->is_memory_constrained()) {
+    // This sequence marks pre-aged code.
+    __ push(esi);  // Callee's context.
+    __ nop();

[Michael Starzinger, 2013/09/17 22:56:44]

IIUC this is a glorified way to store exactly one bit of information, namely
whether a code object is freshly generated and has never been aged before.
Wouldn't it be easier to store that bit of information in the code object
header? This could spare us from adding a NOP to every single method prologue.
Also it would keep platform specific changes to a minimum.

+  } else {
+    // This sequence marks non-aged code.
+    __ nop();
+    __ push(esi);  // Callee's context
+  }
   __ push(edi);  // Callee's JS Function.
   info->AddNoFrameRange(0, masm_->pc_offset());