MIPS: Adapt Danno's Track Allocation Info idea to fast literals.

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 e5a870094801e9e350de82bf0eb52a93ac7535bd..b162d267236cc1f32ddeaee0ea0f08b96065743a 100644
--- a/src/mips/full-codegen-mips.cc
+++ b/src/mips/full-codegen-mips.cc
@@ -1744,6 +1744,15 @@ void FullCodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) {
     FastCloneShallowArrayStub::Mode mode = has_fast_elements
       ? FastCloneShallowArrayStub::CLONE_ELEMENTS
       : FastCloneShallowArrayStub::CLONE_ANY_ELEMENTS;
+
+    // Tracking allocation info allows us to pre-transition later if it makes
+    // sense.
+    if (mode == FastCloneShallowArrayStub::CLONE_ANY_ELEMENTS &&
+        FLAG_track_allocation_sites) {
+      mode = FastCloneShallowArrayStub::
+          CLONE_ANY_ELEMENTS_WITH_ALLOCATION_SITE_INFO;
+    }
+
     FastCloneShallowArrayStub stub(mode, length);
     __ CallStub(&stub);
   }