kernel/x86[_64]: remove get_optimized_functions from cpu modules

The possibility to specify custom memcpy and memset implementations
in cpu modules is currently unused and there is generally no point
in such feature.

There are only 2 x86 vendors that really matter and there isn't
very big difference in performance of the generic optmized versions
of these funcions across different models. Even if we wanted different
versions of memset and memcpy depending on the processor model or
features much better solution would be to use STT_GNU_IFUNC and save
one indirect call.

Long story short, we don't really benefit in any way from
get_optimized_functions and the feature it implements and it only adds
unnecessary complexity to the code.

Signed-off-by: Paweł Dziepak <[email protected]>

headers/private/kernel/arch/x86/arch_cpu.h

@@ -262,13 +262,6 @@ typedef struct x86_mtrr_info {
 	uint8	type;
 } x86_mtrr_info;
 
-typedef struct x86_optimized_functions {
-	void 	(*memcpy)(void* dest, const void* source, size_t count);
-	void*	memcpy_end;
-	void 	(*memset)(void* dest, int value, size_t count);
-	void*	memset_end;
-} x86_optimized_functions;
-
 typedef struct x86_cpu_module_info {
 	module_info	info;
 	uint32		(*count_mtrrs)(void);
@@ -280,8 +273,6 @@ typedef struct x86_cpu_module_info {
 					uint8* _type);
 	void		(*set_mtrrs)(uint8 defaultType, const x86_mtrr_info* infos,
 					uint32 count);
-
-	void		(*get_optimized_functions)(x86_optimized_functions* functions);
 } x86_cpu_module_info;
 
 // features