[Patch] Cleanup gcc.target/arm/interrupt-*.c for thumb mode

[Greta Yorsh]

The tests gcc.target/arm/interrupt-*.c are for ARM mode only. 
This patch uses effective target arm_notthumb instead of __thumb_ predefine,
removes unreachable code, and fixes typos.

Ok for trunk?

Thanks,
Greta

ChangeLog

gcc/testsuite/

2012-02-13  Greta Yorsh  <Greta.Yorsh@arm.com>

        * gcc.target/arm/interrupt-1.c: Fix for thumb mode.
        * gcc.target/arm/interrupt-2.c: Likewise.
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