gas uses nonstandard Intel syntax for memory moves

[Kerrick Staley]

In gas, when using the .intel_syntax directive, you are required to have "mov 
byte ptr [es:0], 0x41" in order to move the value 0x41 into the byte at [es:0]. 
However, I believe the standard syntax is "mov byte [es:0], 0x41". This is the 
syntax used by fasm. It would be nice if you added support for both syntaxes to 
gas. Here is a program that won't compile under gas but should compile under 
fasm:
.intel_syntax noprefix
.code16
mov ax, 0xb800
mov es, ax
mov byte [es:0], 0x41
mov byte [es:1], 0x1f
loop1:
jmp loop1