Move BACKTRACE_NO_TID to BACKTRACE_CURRENT_THREAD.

Use a bit better name for this. The other name was a bit confusing.

Change-Id: I1261f2ee3854a9c8b82133ad0bfbbbe48b43c9ac

(cherry picked from commit 242b1a8c7a5ec73172bac811e51acbc27201f22c)

Conflicts:
	libbacktrace/Backtrace.cpp
4 files changed