add compute_profile_overhead for 64 bit windows

TimeProfile/Windows/compute_profile_overhead.asm

+_TEXT	segment para 'CODE'
+_TEXT	ends
+_DATA	segment para 'DATA'
+_DATA	ends
+
+	extern	p_time:near
+	extern	g_time_hi:near
+	extern	g_time_lo:near
+
+	_TEXT segment
+
+profile_:
+	push	rax
+	push	rdx
+
+	rdtsc
+
+	sub	edx,dword ptr g_time_hi
+	push	rbx
+	mov	ebx,dword ptr g_time_lo
+	mov	eax,eax
+
+	shl	rdx,32
+	sub	rax,rbx
+	add	rax,rdx
+
+	add	qword ptr p_time,rax
+	pop	rbx
+
+	rdtsc
+
+	mov	dword ptr g_time_hi,edx
+	pop	rdx
+	mov	dword ptr g_time_lo,eax
+	pop	rax
+	ret
+
+	public	compute_profile_overhead
+
+compute_profile_overhead:
+	mov	rax,rcx
+	push	rbx
+	push	rcx
+	push	rdx
+	push	rbp
+
+	xor	rcx,rcx
+	xor	rdx,rdx
+	mov	rbx,100000
+
+	call	profile_
+	mov	qword ptr p_time,rcx
+
+compute_profile_overhead_lp1:
+	lea	rbp,p_time
+	call	profile_
+
+	add	rcx,rcx
+	add	rdx,rdx
+
+	sub	rbx,1
+	jne	compute_profile_overhead_lp1
+
+	mov	rcx,qword ptr p_time
+	mov	qword ptr [rax],rcx
+
+	xor	rcx,rcx
+	xor	rdx,rdx
+	mov	rbx,100000
+
+	call	profile_
+	mov	qword ptr p_time,rcx
+
+compute_profile_overhead_lp2:
+	add	rcx,rcx
+	add	rdx,rdx
+	
+	sub	rbx,1
+	jne	compute_profile_overhead_lp2
+
+	call	profile_
+
+	mov	rcx,qword ptr p_time
+	mov	qword ptr 8[rax],rcx
+
+	pop	rbp
+	pop	rdx
+	pop	rcx
+	pop	rbx
+
+	ret
+
+_TEXT	ends
+	end