[vm] Fix g3

Follow-up to https://dart-review.googlesource.com/c/sdk/+/346940.
Follow up to https://dart-review.googlesource.com/c/sdk/+/346907.

TEST=ci
Fixes b/320789794

Change-Id: I82e52a651174d9a84cd05995383255a01257f556
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/346961
Reviewed-by: Emmanuel Pellereau <emmanuelp@google.com>
Commit-Queue: Emmanuel Pellereau <emmanuelp@google.com>
Commit-Queue: Daco Harkes <dacoharkes@google.com>

runtime/platform/unwinding_records.h

diff --git a/runtime/platform/unwinding_records.h b/runtime/platform/unwinding_records.h
index a9b4e5a..e8a7f88 100644
--- a/runtime/platform/unwinding_records.h
+++ b/runtime/platform/unwinding_records.h
@@ -145,6 +145,7 @@
 
 #if !defined(DART_HOST_OS_WINDOWS)
 typedef uint32_t ULONG;
+typedef uint32_t DWORD;
 typedef struct _RUNTIME_FUNCTION {
   ULONG BeginAddress;
   ULONG EndAddress;