deps: V8: cherry-pick a3cc8522a4c8

Original commit message:

    [riscv] avoid cpu probing in li_ptr

    CPU probing is an expensive thing to do and we should avoid doing it upon every li_ptr call.

    Fixes performance regresion bisected in riscv-forks/electron#1

    Change-Id: Ib5ff89b2a730e08de6735123ae60adeffe811ed8
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/5612950
    Commit-Queue: Yahan Lu <yahan@iscas.ac.cn>
    Reviewed-by: Yahan Lu <yahan@iscas.ac.cn>
    Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
    Cr-Commit-Position: refs/heads/main@{#94349}

Refs: v8/v8@a3cc852
PR-URL: nodejs#53412
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.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.14',
+    'v8_embedder_string': '-node.15',
 
     ##### V8 defaults for Node.js #####
 

deps/v8/AUTHORS

@@ -181,6 +181,7 @@ Kevin Gibbons <bakkot@gmail.com>
 Keyhan Vakil <kvakil@googlecontrib.kvakil.me>
 Kris Selden <kris.selden@gmail.com>
 Kyounga Ra <kyounga@alticast.com>
+Levi Zim <rsworktech@outlook.com>
 Loo Rong Jie <loorongjie@gmail.com>
 Lu Yahan <yahan@iscas.ac.cn>
 Ludovic Mermod <ludovic.mermod@gmail.com>

deps/v8/src/codegen/riscv/assembler-riscv.cc

@@ -1087,7 +1087,6 @@ void Assembler::GeneralLi(Register rd, int64_t imm) {
 }
 
 void Assembler::li_ptr(Register rd, int64_t imm) {
-  base::CPU cpu;
   // Initialize rd with an address
   // Pointers are 48 bits
   // 6 fixed instructions are generated