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[arm-embedded] Backport mainline r173371

From: "Terry Guo" <terry dot guo at arm dot com>
To: <gcc-patches at gcc dot gnu dot org>
Date: Wed, 28 Sep 2011 14:28:24 +0800
Subject: [arm-embedded] Backport mainline r173371

Backport mainline r173371 to ARM/embedded-4_6-branch.

Committed.

2011-09-28  Terry Guo  <terry.guo@arm.com>

	Backport r173371 from mainline
	2011-05-04  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>

	* calls.c (emit_library_call_value_1): Invoke
	promote_function_mode hook on libcall arguments.
	* explow.c (promote_function_mode, promote_mode): Handle TYPE
	argument being NULL.
	* targhooks.c (default_promote_function_mode): Lisewise.
	* config/s390/s390.c (s390_promote_function_mode): Likewise.
	* config/sparc/sparc.c (sparc_promote_function_mode): Likewise.

	* doc/tm.texi: Document that TYPE argument might be NULL.

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