[PATCH TEST]Adapt test case gcc.target/i386/l_fma_double_1.c

[Bin Cheng]

Hi,
Test gcc.target/i386/l_fma_double_1.c depends on how many times prolog/epilog loops are unrolled.
This patch adapts the test strings in line with patch at https://gcc.gnu.org/ml/gcc-patches/2017-05/msg01689.html

Bootstrap and test in series on x86_64.  Is it OK?
Thanks,
bin

gcc/testsuite/ChangeLog
2017-05-11  Bin Cheng  <bin.cheng@arm.com>

	* gcc.target/i386/l_fma_double_1.c: Adjust test strings.
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