i386: Add MAX_OPERAND_BUFFER_SIZE

i386: Add MAX_OPERAND_BUFFER_SIZE

When displaying operands, invalid opcodes may overflow operand buffer
due to additional styling characters.  Each style is encoded with 3
bytes.  Define MAX_OPERAND_BUFFER_SIZE for operand buffer size and
increase it from 100 bytes to 128 bytes to accommodate 9 sets of styles
in an operand.

gas/

	PR binutils/29483
	* testsuite/gas/i386/i386.exp: Run pr29483.
	* testsuite/gas/i386/pr29483.d: New file.
	* testsuite/gas/i386/pr29483.s: Likewise.

opcodes/

	PR binutils/29483
	* i386-dis.c (MAX_OPERAND_BUFFER_SIZE): New.
	(obuf): Replace 100 with MAX_OPERAND_BUFFER_SIZE.
	(staging_area): Likewise.
	(op_out): Likewise.