Update toolchain/check/call.cpp

Co-authored-by: Geoff Romer <[email protected]>

Author: jonmeow

toolchain/check/call.cpp

@@ -22,9 +22,9 @@ namespace Carbon::Check {
 namespace {
 // Entity kinds, for diagnostics. Converted to an int for a select.
 enum class EntityKind : uint8_t {
-  Function,
-  GenericClass,
-  GenericInterface,
+  Function = 0,
+  GenericClass = 1,
+  GenericInterface = 2,
 };
 }  // namespace