Update a stale JIT option name.

Change-Id: I4b2f2c215a0258adf52861bac025e32df7f40b14
diff --git a/core/jni/AndroidRuntime.cpp b/core/jni/AndroidRuntime.cpp
index 5546666..7f8e854 100644
--- a/core/jni/AndroidRuntime.cpp
+++ b/core/jni/AndroidRuntime.cpp
@@ -704,10 +704,10 @@
 
 #if defined(WITH_JIT)
     /* Minimal profile threshold to trigger JIT compilation */
-    char jitThresholdBuf[sizeof("-Xthreshold:") + PROPERTY_VALUE_MAX];
+    char jitThresholdBuf[sizeof("-Xjitthreshold:") + PROPERTY_VALUE_MAX];
     property_get("dalvik.vm.jit.threshold", propBuf, "");
     if (strlen(propBuf) > 0) {
-        strcpy(jitThresholdBuf, "-Xthreshold:");
+        strcpy(jitThresholdBuf, "-Xjitthreshold:");
         strcat(jitThresholdBuf, propBuf);
         opt.optionString = jitThresholdBuf;
         mOptions.add(opt);