Core/Jits: Adds an option to disable the register cache.

This will help to disable all inter-instruction dependencies.
So android users can check if only a single instruction is broken without compiling dolphin on their own.

Source/Android/app/src/main/res/values/strings.xml

@@ -254,6 +254,7 @@
     <string name="debug_jitpairedoff">Jit Paired Disabled</string>
     <string name="debug_jitsystemregistersoffr">Jit System Registers Disabled</string>
     <string name="debug_jitbranchoff">Jit Branch Disabled</string>
+    <string name="debug_jitregistercacheoff">Jit Register Cache Disabled</string>
 
     <!-- Miscellaneous -->
     <string name="yes">Yes</string>