[Sema] Fix Windows build after b001d574d7d9

jrtc27 · memfrob · commit ac5263e7adb1 · 2022-10-04T18:05:48.000-04:00
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
@@ -91,6 +91,7 @@
 #include <algorithm>
 #include <bitset>
 #include <cassert>
+#include <cctype>
 #include <cstddef>
 #include <cstdint>
 #include <functional>
