6587322: dtrace probe object__alloc doesn't fire in some situations on amd64

Summary: Fix misplaced probe point
Reviewed-by: rasbold, phh
Contributed-by: neojia@gmail.com

src/cpu/x86/vm/templateTable_x86_64.cpp

@@ -3238,8 +3238,6 @@ void TemplateTable::_new() {
     __ xorl(rcx, rcx); // use zero reg to clear memory (shorter code)
     __ store_klass_gap(rax, rcx);  // zero klass gap for compressed oops
     __ store_klass(rax, rsi);      // store klass last
-    __ jmp(done);
-  }
 
     {
       SkipIfEqual skip(_masm, &DTraceAllocProbes, false);
@@ -3248,7 +3246,11 @@ void TemplateTable::_new() {
       __ call_VM_leaf(
            CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_object_alloc), rax);
       __ pop(atos); // restore the return value
+
     }
+    __ jmp(done);
+  }
+
 
   // slow case
   __ bind(slow_case);