deps: V8: backport 9ab40592f697

Original commit message:

    [riscv] Flush icache in both local and remote harts

    Fix the I-Cache flush flag according to the implementation of flush_icache_mm in Linux kernel.

    Change-Id: I6e6b1f56c377c2c0a629e170737bfac6c357ce8d
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/6080611
    Commit-Queue: Yahan Lu (LuYahan) <yahan@iscas.ac.cn>
    Reviewed-by: Ji Qiu <qiuji@iscas.ac.cn>
    Cr-Commit-Position: refs/heads/main@{#97673}

Refs: v8/v8@9ab4059
PR-URL: #56781
Backport-PR-URL: #56782
Co-authored-by: kxxt <rsworktech@outlook.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Debadree Chatterjee <debadree333@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>

Author: 2 people

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.25',
+    'v8_embedder_string': '-node.26',
 
     ##### V8 defaults for Node.js #####
 

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

@@ -15,12 +15,12 @@ namespace internal {
 void CpuFeatures::FlushICache(void* start, size_t size) {
 #if !defined(USE_SIMULATOR)
   char* end = reinterpret_cast<char*>(start) + size;
-  // The definition of this syscall is
-  // SYSCALL_DEFINE3(riscv_flush_icache, uintptr_t, start,
-  //                 uintptr_t, end, uintptr_t, flags)
-  // The flag here is set to be SYS_RISCV_FLUSH_ICACHE_LOCAL, which is
-  // defined as 1 in the Linux kernel.
-  syscall(SYS_riscv_flush_icache, start, end, 1);
+  // SYS_riscv_flush_icache is a symbolic constant used in user-space code to
+  // identify the flush_icache system call, while __NR_riscv_flush_icache is the
+  // corresponding system call number used in the kernel to dispatch the system
+  // call.
+  // The flag set to zero will flush all cpu cores.
+  syscall(__NR_riscv_flush_icache, start, end, 0);
 #endif  // !USE_SIMULATOR.
 }