sanitizer_stacktrace.cc (GetCanonicFrame): Assume we compiled code with GCC when extracting the caller PC for ARM if...

libsanitizer/

	* sanitizer_common/sanitizer_stacktrace.cc (GetCanonicFrame): Assume we
	compiled code with GCC when extracting the caller PC for ARM if no
	valid frame pointer is available.

From-SVN: r229115