deps: V8: cherry-pick 3ebf2052a1b2

  Original commit message:

    [mips64] Remove a useless declaration of Operand.

    Change-Id: I5144d8315b5c1aca751d138e4d87240b703dc9e3
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3650359
    Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
    Auto-Submit: Yu Liu <liuyu@loongson.cn>
    Reviewed-by: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
    Cr-Commit-Position: refs/heads/main@{#80585}

Refs: v8/v8@3ebf205

PR-URL: #43147
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Minwoo Jung <nodecorelab@gmail.com>
Reviewed-By: Beth Griggs <bgriggs@redhat.com>

common.gypi

@@ -36,7 +36,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.20',
+    'v8_embedder_string': '-node.21',
 
     ##### V8 defaults for Node.js #####
 

deps/v8/src/codegen/mips64/assembler-mips64.h

@@ -71,7 +71,6 @@ class Operand {
       : rm_(no_reg), rmode_(RelocInfo::EXTERNAL_REFERENCE) {
     value_.immediate = static_cast<int64_t>(f.address());
   }
-  V8_INLINE explicit Operand(const char* s);
   explicit Operand(Handle<HeapObject> handle);
   V8_INLINE explicit Operand(Smi value) : rm_(no_reg), rmode_(RelocInfo::NONE) {
     value_.immediate = static_cast<intptr_t>(value.ptr());