Temporarily work around a problem with the LDT code.

We crash at -O2 (in the same code valgrind doesn't like) but not at -O0.
Using the #pragma to just use -O0 for that file doesn't help. So for now
we'll have to suffer the 2x slowdown until someone gets change to find
and fix this.

Change-Id: Ibcd2b5d4aba9044abb353f6d38dbce0705935a7f
diff --git a/build/Android.common.mk b/build/Android.common.mk
index de2622a..575c810 100644
--- a/build/Android.common.mk
+++ b/build/Android.common.mk
@@ -25,7 +25,7 @@
 	dalvik/libdex
 
 ART_CFLAGS := \
-	-O2 \
+	-O0 \
 	-ggdb3 \
 	-Wall \
 	-Werror \