Merge pull request #78181 from DougGregor/diag-change-less-rebuilding

Stop rebuilding the world whenever a diagnostic changes

Author: DougGregor

include/swift/AST/DiagnosticGroups.h

@@ -18,13 +18,13 @@
 #ifndef SWIFT_DIAGNOSTICGROUPS_H
 #define SWIFT_DIAGNOSTICGROUPS_H
 
-#include "swift/AST/DiagnosticList.h"
 #include "llvm/ADT/ArrayRef.h"
 #include <array>
 #include <string_view>
 #include <unordered_map>
 
 namespace swift {
+enum class DiagID : uint32_t;
 
 enum class DiagGroupID : uint16_t {
 #define GROUP(Name, Version) Name,

lib/AST/DiagnosticGroups.cpp

@@ -16,6 +16,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "swift/AST/DiagnosticGroups.h"
+#include "swift/AST/DiagnosticList.h"
 #include <unordered_set>
 
 namespace swift {