tc-i386.c: store encoded instructions in unsigned char[]

tc-i386.c: store encoded instructions in unsigned char[]

char can be a signed type, and some of the values in these arrays are greater
than 0x80 which means they are outside of the range a signed char can store.
Fortunately it seems most compilers handle this in the obvious way by storing
the same bits as a negative number, but this is wierd and easily fixed.

gas/ChangeLog:

2016-03-20  Trevor Saunders  <tbsaunde+binutils@tbsaunde.org>

	* tc-i386.c (f32_1): Change type to unsigned char[].
	(f32_2): Likewise.
	(f32_3): Likewise.
	(f32_4): Likewise.
	(f32_5): Likewise.
	(f32_6): Likewise.
	(f32_7): Likewise.
	(f32_8): Likewise.
	(f32_9): Likewise.
	(f32_10): Likewise.
	(f32_11): Likewise.
	(f32_12): Likewise.
	(f32_13): Likewise.
	(f32_14): Likewise.
	(f16_3): Likewise.
	(f16_4): Likewise.
	(f16_5): Likewise.
	(f16_6): Likewise.
	(f16_7): Likewise.
	(f16_8): Likewise.
	(jump_31): Likewise.
	(f32_patt): Likewise.
	(f16_patt): Likewise.
	(alt_3): Likewise.
	(alt_4): Likewise.
	(alt_5): Likewise.
	(alt_6): Likewise.
	(alt_7): Likewise.
	(alt_8): Likewise.
	(alt_9): Likewise.
	(alt_10): Likewise.
	(alt_patt): Likewise.