[riscv64] Link should greater and equal zero

Change-Id: Ieeb5888efc068707766aef6ba6fc842c5deaaf9c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3146673
Commit-Queue: Yahan Lu <yahan@iscas.ac.cn>
Auto-Submit: Yahan Lu <yahan@iscas.ac.cn>
Reviewed-by: Ji Qiu <qiuji@iscas.ac.cn>
Cr-Commit-Position: refs/heads/main@{#76784}

src/codegen/riscv64/assembler-riscv64.cc

@@ -703,7 +703,7 @@ void Assembler::next(Label* L, bool is_internal) {
   if (link == kEndOfChain) {
     L->Unuse();
   } else {
-    DCHECK_GT(link, 0);
+    DCHECK_GE(link, 0);
     DEBUG_PRINTF("next: %p to %p (%d)\n", L,
                  reinterpret_cast<Instr*>(buffer_start_ + link), link);
     L->link_to(link);