[SH][committed] Fix sp-switch testcase when there is no underscore prefix

[Oleg Endo]

Hi,

The attached patch fixes symbol matching in the sh/sp-switch.c testcase
to allow zero or more prefix underscores.  This should make the test
pass on sh4-linux.
Tested on sh-sim with
make check-gcc RUNTESTFLAGS="sh.exp=sp-switch.c --target_board=sh-sim
\{-m4/-ml}"
and
make check-gcc RUNTESTFLAGS="sh.exp=sp-switch.c --target_board=sh-sim
\{-m4/-ml/-fno-leading-underscore}"
Committed as r218706.

Cheers,
Oleg

gcc/testsuite/ChangeLog:
        * gcc.target/sh/sp-switch.c: Match zero or more underscores in
        alt_stack symbol.

Index: gcc/testsuite/gcc.target/sh/sp-switch.c
===================================================================
--- gcc/testsuite/gcc.target/sh/sp-switch.c	(revision 218604)
+++ gcc/testsuite/gcc.target/sh/sp-switch.c	(working copy)
@@ -1,6 +1,6 @@
 /* { dg-do compile }  */
 /* { dg-final { scan-assembler "mov\tr0,r15" } } */
-/* { dg-final { scan-assembler ".long\t_alt_stack" } } */
+/* { dg-final { scan-assembler ".long\t\[_\]*alt_stack" } } */
 
 void *alt_stack;
 void f() __attribute__ ((interrupt_handler, sp_switch ("alt_stack")));