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	align the stack when it's going to be saved.

	testsuite/
	* gcc.target/arm/interrupt-1.c: New test.
	* gcc.target/arm/interrupt-2.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@162078 138bc75d-0d04-0410-961f-82ee72b054a4