Backport Tizen specific stuff from VDLinux 6.

Backport Tizen specific stuff from VDLinux 6.

Backport from VDLinux 5. Optionally mount /proc in __asan_init to allow
systemd sanitization.

	2014-10-21  Yury Gribov <y.gribov@samsung.com>

	JIRA: MAVDT-64

	* libsanitizer/asan/asan_rtl.cc (MaybeMountProcFS): New function.
	(__asan_init): Call MaybeMountProcFS.

Mount /proc not only in AsanInitInternal, but also in __asan_init and AsanInitializer to
ensure we have proc mounted when needed.

	* libsanitizer/asan/asan_rtl.cc (__asan_init): Call MaybeMountProcFS.
	* (AsanInitializer): Likewise.

Set address space unlimited if it is not.

	* libsanitizer/asan/asan_rtl.cc (MaybeDisableUlimit): New function.
	(AsanInitInternal): Call it.

Read ASan and UBSan options from predefined file if it is available.

	* libsanitizer/asan/asan_flags.cc: Read ASAN_OPTIONS from predefined
	file if available.
	* libsanitizer/ubsan/ubsan_flags.cc: Likewise.

Change-Id: I43c68a801fef60c6b8c7adb86695fd178f408c21
Signed-off-by: Maxim Ostapenko <m.ostapenko@samsung.com>