[gardening] Clean up msvc-flagged redundant casts.

TEST=msvc ci
BUG=#52002

Change-Id: I9a2865e6e55c1924e40aa0c946bfe1c3ce969d69
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/294363
Reviewed-by: Ryan Macnak <[email protected]>
Commit-Queue: Alexander Aprelev <[email protected]>

Author: aam

runtime/vm/unwinding_records_win.cc

@@ -102,8 +102,8 @@ void UnwindingRecords::RegisterExecutablePage(Page* page) {
           /*FunctionTable=*/record->runtime_function,
           /*EntryCount=*/record->runtime_function_count,
           /*MaximumEntryCount=*/record->runtime_function_count,
-          /*RangeBase=*/reinterpret_cast<DWORD64>(page->memory_->start()),
-          /*RangeEnd=*/reinterpret_cast<DWORD64>(page->memory_->end())) != 0) {
+          /*RangeBase=*/page->memory_->start(),
+          /*RangeEnd=*/page->memory_->end()) != 0) {
     FATAL("Failed to add growable function table: %d\n", GetLastError());
   }
 }