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

src/mips/assembler-mips.h

Index: src/mips/assembler-mips.h
diff --git a/src/mips/assembler-mips.h b/src/mips/assembler-mips.h
index cb0896a8dedb16446c2f93304c7a1a2cbc14902b..4d16f745d385dea69a112e5323ea58ce2d820257 100644
--- a/src/mips/assembler-mips.h
+++ b/src/mips/assembler-mips.h
@@ -589,7 +589,8 @@ class Assembler : public AssemblerBase {
     FIRST_IC_MARKER = PROPERTY_ACCESS_INLINED,
     // Code aging
     CODE_AGE_MARKER_NOP = 6,
-    CODE_AGE_SEQUENCE_NOP
+    CODE_AGE_YOUNG_SEQUENCE_NOP,
+    CODE_AGE_PRE_AGED_SEQUENCE_NOP
   };
 
   // Type == 0 is the default non-marking nop. For mips this is a