platform: Fix GetStackStart for ARM64 Win

Tbr: ulan@chromium.org
Bug: chromium:1056170
Change-Id: I118b8f1911a6d61b15d3dee25aa00ab9dea4689f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2124321Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66894}

src/base/platform/platform-win32.cc

@@ -1396,10 +1396,18 @@ void OS::AdjustSchedulingParams() {}
 
 // static
 void* Stack::GetStackStart() {
-#if defined(V8_TARGET_ARCH_32_BIT)
+#if defined(V8_TARGET_ARCH_X64)
+  return reinterpret_cast<void*>(__readgsqword(offsetof(NT_TIB64, StackBase)));
+#elif defined(V8_TARGET_ARCH_32_BIT)
   return reinterpret_cast<void*>(__readfsdword(offsetof(NT_TIB, StackBase)));
+#elif defined(V8_TARGET_ARCH_ARM64)
+  // Windows 8 and later, see
+  // https://docs.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-getcurrentthreadstacklimits
+  ULONG_PTR lowLimit, highLimit;
+  ::GetCurrentThreadStackLimits(&lowLimit, &highLimit);
+  return reinterpret_cast<void*>(highLimit);
 #else
-  return reinterpret_cast<void*>(__readgsqword(offsetof(NT_TIB64, StackBase)));
+#error Unsupported GetStackStart.
 #endif
 }