sparc.c (sparc_asm_function_epilogue): Don't output an extra nop past a sibling call at the very end.

        * config/sparc/sparc.c (sparc_asm_function_epilogue): Don't output
        an extra nop past a sibling call at the very end.

        testsuite/
        * gcc.target/sparc/sibcall-dslot.c: New testcase.

From-SVN: r163395