* config/tc-sh.c (parse_at): Set arg type of @(expr,pc) to

* config/tc-sh.c (parse_at): Set arg type of @(expr,pc) to
A_DISP_PC only if it's an integral constant, and to
A_DISP_PC_ABS otherwise.
(get_specific): Accept A_DISP_PC_ABS where A_DISP_PC is
expected.
(build_Mytes): Mark PCRELIMM fix-ups as pc-relative only if
the operand type is not A_DISP_PC_ABS.