Transparent handling of SIGSEGV in java code on android

[labath]

Bugzilla Link	23607
Version	unspecified
OS	Linux

Extended Description

ART runtime (and dalvik?) use SIGSEGV to detect and generate NullPointerExceptions in Java.

Ideally, on Android, if we see a SIGSEGV at a PC that belongs to jit code we should probably just transparently continue the process.

However, segmentation faults it native code should still stop the debuggee.