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

src/mips/full-codegen-mips.cc

Index: src/mips/full-codegen-mips.cc
diff --git a/src/mips/full-codegen-mips.cc b/src/mips/full-codegen-mips.cc
index df3f4170b1ae7fa3b0355e6f52ce18a9d73638d0..8e0520c654b76f0ff6a2b3e2631de5f3e491a4ea 100644
--- a/src/mips/full-codegen-mips.cc
+++ b/src/mips/full-codegen-mips.cc
@@ -174,7 +174,9 @@ void FullCodeGenerator::Generate() {
   // The following three instructions must remain together and unmodified for
   // code aging to work properly.
   __ Push(ra, fp, cp, a1);
-  __ nop(Assembler::CODE_AGE_SEQUENCE_NOP);
+  __ nop(isolate()->is_memory_constrained() ?
+         Assembler::CODE_AGE_PRE_AGED_SEQUENCE_NOP :
+         Assembler::CODE_AGE_YOUNG_SEQUENCE_NOP);
   // Adjust fp to point to caller's fp.
   __ Addu(fp, sp, Operand(2 * kPointerSize));
   info->AddNoFrameRange(0, masm_->pc_offset());