Allow nested instruction counting.

It is traditional to store counts in variables with more than one
bit of storage.

Also, fixed some of the decorations.

Bug 2863796.

Change-Id: I167d6803e955159e35e75d1e2924754145ea1361
diff --git a/vm/Globals.h b/vm/Globals.h
index 5362916..f28aab5 100644
--- a/vm/Globals.h
+++ b/vm/Globals.h
@@ -637,7 +637,7 @@
      * Dalvik instruction counts (256 entries).
      */
     int*        executedInstrCounts;
-    bool        instructionCountEnableCount;
+    int         instructionCountEnableCount;
 
     /*
      * Signal catcher thread (for SIGQUIT).