runtime: mark amd64 runtime·rt0_go as NOFRAME

This CL adds the NOFRAME flag to runtime·rt0_go, which should
had been added in CL 459395 but didn't and broke fix windows-amd64-2008.

Change-Id: I4583f2034bf114e1f7aaddef9ba505f53536c3eb
Reviewed-on: https://go-review.googlesource.com/c/go/+/463120
Run-TryBot: Quim Muntal <quimmuntal@gmail.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Auto-Submit: Quim Muntal <quimmuntal@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
diff --git a/src/runtime/asm_amd64.s b/src/runtime/asm_amd64.s
index 6720c20..f5a83f2 100644
--- a/src/runtime/asm_amd64.s
+++ b/src/runtime/asm_amd64.s
@@ -156,7 +156,7 @@
 
 #endif
 
-TEXT runtime·rt0_go(SB),NOSPLIT|TOPFRAME,$0
+TEXT runtime·rt0_go(SB),NOSPLIT|NOFRAME|TOPFRAME,$0
 	// copy arguments forward on an even stack
 	MOVQ	DI, AX		// argc
 	MOVQ	SI, BX		// argv