Conditionally compile support for --enable-mapped_location.

	* tree-mudflap.c (mf_file_function_line_tree):  Take a location_t
	rather than a pointer to one.  Use expand_location.
	(mf_varname_tree):  Use expand_location.
	* tree-dump.c:  Use expand_location on DECL_SOURCE_LOCATION.
	* coverage.c:  Likewise.
	* print-tree.c:  Likewise.
	* c-aux-info.c (gen_aux_info_record):  Likewise.
	* c-parse.in:  Use SET_EXPR_LOCATION macro.
	* gimple-low.c:  Likewise.
	* tree-mudflap.c:  Likewise.
	* gimplify.c:  Likewise.  Also use EXPR_LOCATION and EXPR_HAS_LOCATION.
	* c-ppoutput.c:  Use new source_location typedef instead of fileline.
	* c-semantics.c:  Use new macros.
	* c-typeck.c:  Likewise.

From-SVN: r83920