Fix the assembler's floating point number parser so that it can correctly handle...

Fix the assembler's floating point number parser so that it can correctly handle numbers encoded as a leading decimal point, followed by zeroes, followed by a non-zero sequence.

	* atof-generic.c (atof_generic): Do not ignore leading zeros if
	they appear after a decimal point.
	* testsuite/gas/all/float.s: Extend test to include a number with
	a leading decimal point followed by several zeroes.
	* testsuite/gas/i386/fp.s: Likewise.
	* testsuite/gas/i386/fp.d: Update expected output.