If branch changer which changes the opcodes.

This program mutates the program by changing the current if comparision
operators.

Test: run dexfuzz with the two mutations
Change-Id: I1b8a3009bc829678d84f3f2fb42d0e6ba3deeb0a
diff --git a/tools/dexfuzz/README b/tools/dexfuzz/README
index 78f73f5..3c0c65e 100644
--- a/tools/dexfuzz/README
+++ b/tools/dexfuzz/README
@@ -139,7 +139,9 @@
 InstructionSwapper 80
 NewMethodCaller 10
 NonsenseStringPrinter 10
+OppositeBranchChanger 40
 PoolIndexChanger 30
+RandomBranchChanger 30
 RandomInstructionGenerator 30
 SwitchBranchShifter 30
 TryBlockShifter 40