dtrace/amd64: Remove the dtrace_invop_callsite symbol

It is not needed after commit 7e80fd5ef397.  No functional change
intended.

Reviewed by:	avg
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D46675

sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h

@@ -2400,8 +2400,10 @@ extern int dtrace_mach_aframes(void);
 
 #if defined(__i386) || defined(__amd64)
 extern int dtrace_instr_size_isa(uint8_t *, model_t, int *);
+#ifdef __i386
 extern void dtrace_invop_callsite(void);
 #endif
+#endif
 extern void dtrace_invop_add(int (*)(uintptr_t, struct trapframe *, uintptr_t));
 extern void dtrace_invop_remove(int (*)(uintptr_t, struct trapframe *,
     uintptr_t));

sys/cddl/dev/dtrace/amd64/dtrace_asm.S

@@ -56,9 +56,6 @@
 	swapgs;					\
 1:	addq	$TF_RIP,%rsp;
 
-.globl dtrace_invop_callsite
-.type dtrace_invop_callsite,@function
-
 	ENTRY(dtrace_invop_start)
 
 	/*
@@ -78,7 +75,6 @@
 	movq	%rsp, %rdx
 
 	call	dtrace_invop
-dtrace_invop_callsite:
 	addq	$16, %rsp
 
 	cmpl	$DTRACE_INVOP_PUSHL_EBP, %eax