Declaring the CPU architecture in the middle of an assembly file is

somewhat redundant, and also causes gas to complain when we include
the profiling code (which uses an i586 instruction).

src/arch/i386/include/librm.h

 #define TEXT16_CODE( asm_code_str )			\
 	".section \".text16\", \"ax\", @progbits\n\t"	\
 	".code16\n\t"					\
-	".arch i386\n\t"				\
 	asm_code_str "\n\t"				\
 	".code32\n\t"					\
 	".previous\n\t"