Optimize IMT

* Remove IMT for classes which do not implement interfaces
* Remove IMT for array classes
* Share same IMT

Saved memory (measured on hammerhead):
boot.art:
Total number of classes: 3854
Number of affected classes: 1637
Saved memory: 409kB

Chrome (excluding classes in boot.art):
Total number of classes: 2409
Number of affected classes: 1259
Saved memory: 314kB

Google Maps (excluding classes in boot.art):
Total number of classes: 6988
Number of affected classes: 2574
Saved memory: 643kB

Performance regression on benchmarks/InvokeInterface.java benchmark
(measured timeCall10Interface)
1st launch: 9.6%
2nd launch: 6.8%

Change-Id: If07e45390014a6ee8f3c1c4ca095b43046f0871f
diff --git a/runtime/gc/space/image_space.cc b/runtime/gc/space/image_space.cc
index 78c570f..1ebe5cc 100644
--- a/runtime/gc/space/image_space.cc
+++ b/runtime/gc/space/image_space.cc
@@ -1130,6 +1130,10 @@
       image_header.VisitPackedArtFields(&field_visitor, target_base);
     }
     {
+      TimingLogger::ScopedTiming timing("Fixup imt", &logger);
+      image_header.VisitPackedImTables(fixup_adapter, target_base, pointer_size);
+    }
+    {
       TimingLogger::ScopedTiming timing("Fixup conflict tables", &logger);
       image_header.VisitPackedImtConflictTables(fixup_adapter, target_base, pointer_size);
     }