[PATCH][committed] Use signed char for loop var in gcc.c-torture/execute/pr58419.c

[Kyrill Tkachov]

Hi all,

The recently added testcase gcc.c-torture/execute/pr58419.c uses a char 
variable to count down with negative values.
But on some architectures (like arm) a char is by default unsigned, 
causing the loop to be infinite.

I've committed the attached patch to explicitly label the variable as 
signed char.
Committed as r202703.

This fixes a timeout failure I've observed on arm an aarch64.

Thanks,
Kyrill

[gcc/testsuite/]
2013-09-18  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     * gcc.c-torture/execute/pr58419.c (b): Change type to signed char.
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