[PATCH][GCC][Arm][libsanitizer] Fix arm libsanitizer bootstrap failure

[Tamar Christina]

Hi All,

Glibc has recently introduced changed to the mode field in ipc_perm
in commit 2f959dfe849e0646e27403f2e4091536496ac0f0. For Arm this
means that the mode field no longer has the same size.

This causes an assert failure against libsanitizer's internal copy
of ipc_perm.  Since this change can't be easily detected I am adding
arm to the list of targets that are excluded from this check.  libsanitizer
doesn't use this field (and others, it in fact uses only 1 field) so this check
can be ignored.

Padding bits were used by glibc when the field was changed so sizeof and offsets
of the remaining fields should be the same.

Bootstrapped arm-none-linux-gnueabihf and no issues.

Ok for trunk?

Thanks,
Tamar

libsanitizer/ChangeLog:

2019-10-22  Tamar Christina  <tamar.christina@arm.com>

	PR sanitizer/92154
	* sanitizer_common/sanitizer_platform_limits_posix.cpp (defined):
	Exclude arm.

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