Remove Report keyword for options

Since g:7caa4970 the option is ignored
as we print used command line for -fverbose-asm output.

gcc/ChangeLog:

	* doc/options.texi: Remove Report keyword.
	* opt-functions.awk: Print error when Report keyword
	is used.
	* optc-gen.awk: Do not handle Report keyword.
	* opts.h (struct cl_option): Remove cl_report bitfield flag.