This patch cleans up the -mpc-relative-loads option processing.  Rename to avoid
the confusing nopcrelative_literal_loads names.  Fix the option processing code
to correctly support -mno-pc-relative-loads rather than ignore it. 

    gcc/
	* config/aarch64/aarch64.opt
	(mpc-relative-literal-loads): Rename internal option name.
	* config/aarch64/aarch64.c
	(aarch64_nopcrelative_literal_loads): Rename to 
	aarch64_pcrelative_literal_loads.
	(aarch64_expand_mov_immediate): Likewise.
	(aarch64_secondary_reload): Likewise.
	(aarch64_can_use_per_function_literal_pools_p): Likewise.
	(aarch64_override_options_after_change_1): Rename and simplify logic.
	(aarch64_classify_symbol): Merge large model checks into switch,
	remove pc-relative load check.

From-SVN: r237607