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

src/arm/full-codegen-arm.cc

Index: src/arm/full-codegen-arm.cc
diff --git a/src/arm/full-codegen-arm.cc b/src/arm/full-codegen-arm.cc
index b6fb70b5df0f5c86a621f6711c5f8a24e7f7be8d..be7cea512b918219d3fe00fa671aabac91006f6b 100644
--- a/src/arm/full-codegen-arm.cc
+++ b/src/arm/full-codegen-arm.cc
@@ -169,7 +169,9 @@ void FullCodeGenerator::Generate() {
     // The following three instructions must remain together and unmodified
     // for code aging to work properly.
     __ stm(db_w, sp, r1.bit() | cp.bit() | fp.bit() | lr.bit());
-    __ nop(ip.code());
+    // Pre-age code objects on memory constrained devices.
+    __ nop(isolate()->is_memory_constrained() ?
+           kPreAgeCodeNopType : kNoAgeCodeNopType);
     // Adjust FP to point to saved FP.
     __ add(fp, sp, Operand(2 * kPointerSize));
   }