deps: V8: cherry-pick 56816d76c121

Original commit message:

    [loong64] Supplement a LoongArch support in include/v8config.h

    Change-Id: I658c1b781163bcd3ca39bfceb74aef9d255247b8
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3894795
    Reviewed-by: Toon Verwaest <verwaest@chromium.org>
    Commit-Queue: Liu Yu <liuyu@loongson.cn>
    Cr-Commit-Position: refs/heads/main@{#83374}

PR-URL: #45353
Refs: v8/v8@56816d7
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Jiawen Geng <technicalcute@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.18',
+    'v8_embedder_string': '-node.19',
 
     ##### V8 defaults for Node.js #####
 

deps/v8/include/v8config.h

@@ -703,6 +703,8 @@ V8 shared library set USING_V8_SHARED.
 #define V8_TARGET_ARCH_ARM 1
 #elif defined(__mips64)
 #define V8_TARGET_ARCH_MIPS64 1
+#elif defined(__loongarch64)
+#define V8_TARGET_ARCH_LOONG64 1
 #elif defined(_ARCH_PPC64)
 #define V8_TARGET_ARCH_PPC64 1
 #elif defined(_ARCH_PPC)