Clean up whitespace, comments, etc.

Clean up whitespace, comments, etc.

(TARGET_SH, RTL_BIT, DT_BIT, C_BIT, R_BIT, TARGET_DUMP_RTL,
TARGET_DUMP_R, TARGET_CDUMP): Delete.
(TARGET_SWITCHES): Delete -mR, -mc, -mr options.
(CONST_DOUBLE_OK_FOR_LETTER_P): Delete 'G' contraint.
(FUNCTION_VALUE): Simplify.
(REG_OK_FOR_PRE_POST_P, IS_INDEX): Delete.
(BASE_REGISTER_RTX_P, INDEX_REGISTER_RTX_P): Rewrite to allow
SUBREGs.
(GO_IF_LEGITIMATE_INDEX): Delete unused REGNO argument.
(GO_IF_LEGITIMATE_ADDRESS): Use BASE_REGISTER_RTX_P instead of
REG_OK_FOR_PRE_POST_P.  Don't accept PRE_INC or POST_DEC addresses.
(PREDICATE_CODES, PROMOTE_MODE): Define.

From-SVN: r9570