New experimental GC stress mode

Tries to do a GC for every unique call stack (up to 16 frames).
The goal is to catch moving GC bugs and lock violations without being
rediculously slow. Some tests fail on 64 bits, 32 bit host doesn't
work. N5 is booting.

Added runtime -Xgc options: gcstress and nogcstress.

Bug: 21664466

Change-Id: Icb8e420f2048e8ee83bcca7937563166a2638f5c
diff --git a/runtime/mirror/class-inl.h b/runtime/mirror/class-inl.h
index 8c9222f..9ffa4c2 100644
--- a/runtime/mirror/class-inl.h
+++ b/runtime/mirror/class-inl.h
@@ -757,7 +757,7 @@
 }
 
 inline void Class::SetSlowPath(bool enabled) {
-  SetFieldBoolean<false>(GetSlowPathFlagOffset(), enabled);
+  SetFieldBoolean<false, false>(GetSlowPathFlagOffset(), enabled);
 }
 
 inline void Class::InitializeClassVisitor::operator()(