* config/i386/mingw32.h (OUTPUT_QUOTED_STRING): Properly output
	quoted strings.
	* dwarf2out.c (lookup_filename): Properly quote filename in .file
	directive in assembly file.
	* config/m68k/dpx2.h (ASM_OUTPUT_SOURCE_FILENAME): Likewise.
	* config/m88k/m88k.h (ASM_OUTPUT_SOURCE_FILENAME): Likewise.
	* config/pj/pj.h (ASM_FILE_START): Likewise.
	* config/rs6000/xcoff.h (ASM_FILE_START): Likewise.
	* config/avr/avr.c (asm_file_end): Likewise.
	* toplev.c (output_quoted_string): Handle possibly signed plain
	char.
	* toplev.h (output_clean_symbol_name): Declare
	* toplev.c (output_clean_symbol_name): Define.
	* config/alpha/alpha.c (unicosmk_output_module_name): Use it.
	* config/1750a/1750a.h (ASM_FILE_START): Likewise.

Co-Authored-By: Zack Weinberg <zack@codesourcery.com>

From-SVN: r53817