Avoid unnecessary exception checks.

While we have inlined some handling functions in interpreter, we still have
conditional exception check in them. For instance, field access doesn't need to
check for a pending exception.
To help the compiler, these handling functions now return a boolean indicating
if an exception is pending.
Also updates macro POSSIBLY_HANDLE_PENDING_EXCEPTION to check against this
boolean.

Change-Id: I5e323e2ca0e06f43ad89871b124dd28c8d4a47fc