Correct errors in comments.

(CONDITIONAL_REGISTER_USAGE): Delete TARGET_NOSAVE support.
(TARGET_MAC, TARGET_TRYR0, TARGET_NOSAVE, TARGET_SMALLCALL,
TARGET_PARANOID, TARGET_RETR2, TARGET_SHORTADDR, TARGET_BSR): Delete.
(TARGET_SWITCHES): Delete above options.
(OVERRIDE_OPTIONS): Delete TARGET_BSR support.
(FUNCTION_BOUNDARY): Use 32 bit alignment when not TARGET_SMALLCODE.
(FIRST_RET_REG): Delete TARGET_RETR2 support.
(MODE_DISP_OK_[21]): Delete TARGET_TRYR0 support.
(EXTRA_CONSTRAINT_U): Delete.
(CONST_COSTS): For logical operations, give L constants cost 1.
(PRINT_OPERAND_PUNCT_VALID_P): Delete '*', '^', '!'.

From-SVN: r8890