* tc-mips.c (mips_cprestore_valid): New flag.
(mips_frame_reg_valid): New flag.
(macro) [M_JAL_2]: Check both flags.
[M_JAL_A]: Likewise.
(s_cprestore): Set mips_cprestore_valid.
(tc_get_register): If setting mips_frame_reg, set
mips_frame_reg_valid and clear mips_cprestore_valid.
(s_mips_ent): Clear both flags.
(s_mips_end): Clear both flags.