ABI checker: downgrade missing @available attributes to warnings. rdar://84278884

Author: nkcsgexi

include/swift/AST/DiagnosticsModuleDiffer.def

@@ -76,7 +76,7 @@ ERROR(type_witness_change,none,"%0 has type witness type for %1 changing from %2
 
 ERROR(decl_new_witness_table_entry,none,"%0 now requires%select{| no}1 new witness table entry", (StringRef, bool))
 
-ERROR(new_decl_without_intro,none,"%0 is a new API without @available attribute", (StringRef))
+WARNING(new_decl_without_intro,none,"%0 is a new API without @available attribute", (StringRef))
 
 ERROR(objc_name_change,none,"%0 has ObjC name change from %1 to %2", (StringRef, StringRef, StringRef))
 

test/api-digester/breakage-allowlist.swift

@@ -24,14 +24,14 @@
 
 // RUN: not %api-digester -diagnose-sdk -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -compiler-style-diags
 
-// RUN: not %api-digester -diagnose-sdk -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -compiler-style-diags -breakage-allowlist-path %t/incomplete-allowlist.txt
+// RUN: %api-digester -diagnose-sdk -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -compiler-style-diags -breakage-allowlist-path %t/incomplete-allowlist.txt
 
 // RUN: %api-digester -diagnose-sdk -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -compiler-style-diags -breakage-allowlist-path %t/complete-allowlist.txt
 
 // RUN: not %api-digester -diagnose-sdk -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -serialize-diagnostics-path %t/serialized-diag.dia
 // RUN: ls %t/serialized-diag.dia
 
-// RUN: not %api-digester -diagnose-sdk -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -serialize-diagnostics-path %t/serialized-diag.dia -breakage-allowlist-path %t/incomplete-allowlist.txt
+// RUN: %api-digester -diagnose-sdk -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -serialize-diagnostics-path %t/serialized-diag.dia -breakage-allowlist-path %t/incomplete-allowlist.txt
 // RUN: ls %t/serialized-diag.dia
 
 // RUN: %api-digester -diagnose-sdk -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -serialize-diagnostics-path %t/serialized-diag.dia -breakage-allowlist-path %t/complete-allowlist.txt