Don't crash if the perf map creation failed

The perf map file is used in the jit compiler to emit the symbol name
for the start address of each jitted function. The file is stored in
/data/misc/trace (previously /data) what is only accessible on
userdebug builds. This change modifies the code to work on user builds
with not using the perf map file if we failed to create it.

Change-Id: Icfecd4bdab94ffc528ec218f3ac2b872fbdacf37