Remove unused labels, variables, and functions.  Enable warnings.

Change-Id: Icbe24eaf1ad499f28b68b6a5f05368271a0a7e86
diff --git a/vm/Misc.c b/vm/Misc.c
index 87f4c81..21b7fce 100644
--- a/vm/Misc.c
+++ b/vm/Misc.c
@@ -323,7 +323,7 @@
  */
 int dvmCountSetBits(const BitVector* pBits)
 {
-    int word, bit;
+    int word;
     int count = 0;
 
     for (word = 0; word < pBits->storageSize; word++) {