Revert " Disable dalvikVM logcat entires"

This reverts commit 918fc6b4412d2b7a63f49a9c2d7b0027958e49d5.
Disable DalvikVM GC logcat spam

Dalvik logs everytime a garbage collection is run. Disabled to remove
clutter from logcat. Can be renabled by #defining DEBUG.

Change-Id: I57a461857f8d0ecbf223f3c18187f62095adb5b4
Fix a minor leak in handleVM_CreateString

Change-Id: I3273e5d2eb4621202837c43270a466fe056d6894
Dump native stacks for all threads in native code.

Bug: 7432159
Change-Id: I83cb530155edfc35ae3be0f7a2a044245223d2d5
Remove dead instruction in common_exceptionThrown.

Addresses bug: https://code.google.com/p/android/issues/detail?id=43920

Change-Id: Ie735222db17b883416543ca5617b4f02fd8a8d76