[patch] tweak gcc.target/mips/msa.c options

[Sandra Loosemore]

The testcase gcc.target/mips/msa.c gives dozens of FAILs if it's tested 
with a GCC configured to default to -fno-common, because of patterns like

/* { dg-final { scan-assembler-times "\t.comm\tv16i8_\\d+,16,16" 3 } } */

Seems like the simplest solution is to force -fcommon for this test.  OK?

-Sandra

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