[Jit] Fix for 3311468 Maps crashed at handleFmt...

Change https://android-git.corp.google.com/g/#change,86452 eliminated unused
chaining cells for direct JNI calls.   However, a code path in CodegenDriver.c
assumed all similar invokes would have such cells.  Slightly re-arranged the
to avoid relying on the existance of the cell in cases in which it isn't
needed.

Change-Id: Ifc28acf559455a292b4b915ef1302085557e1d81
1 file changed