[patch, testsuite] fix test gcc.dg/pr50908-2.c

[Greta Yorsh]

The test gcc.dg/pr50908-2.c fails on arm and other targets where short enums
is the default. 

arm-none-eabi-gcc
/work/local-checkouts/main/gcc-fsf/gcc/testsuite/gcc.dg/pr50908-2.c
/work/local-checkouts/main/gcc-fsf/gcc/testsuite/gcc.dg/pr50908-2.c:39:8:
error: width of 'code' exceeds its type

The compile error has nothing to do with the intended functionality of this
test. The error is due to the use of a bitfield in the test: "enum rtx_code
code:16".

This patch adds the missing compiler option -fno-short-enums to the test.

gcc/testsuite/ChangeLog

2012-01-24  Greta Yorsh  <Greta.Yorsh@arm.com>

	* gcc.dg/pr50908-2.c (dg-options): Add -fno-short-enums.
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