* gdb/stabsread.c (define_symbol): Add support for char

	* gdb/stabsread.c (define_symbol): Add support for char
	and string constants.

	* gdb/testsuite/gdb.stabs/aout.sed: Convert all backslash to double backslash
	within one line, unless it is followed by a double quote.
	* gdb/testsuite/gdb.stabs/hppa.sed: Idem.
	* gdb/testsuite/gdb.stabs/weird.def: Add char and String constants
	* gdb/testsuite/gdb.stabs/weird.exp: Check for correct parsing of
	chhar and string constants.
	* gdb/testsuite/gdb.stabs/xcoff.sed: Ignore escaped quote quotes
	in .stabs to .stabx substitution.