stdlib: fix the build with macOS long tests

When building swift on macOS with long tests, the build would fail with
undefined references to these symbols.  The undefined symbols were
expected to be present in swiftCore against which we link.  However,
because the symbols are marked as internal, they would be dead stripped
before the dylib was constructed.  As a result, we would end up with
undefined references to these symbols.  Expose the additional internal
interfaces for now so that we can build the tests.

Author: compnerd

unittests/runtime/Stdlib.cpp

@@ -119,3 +119,23 @@ bool _swift_dictionaryDownCastConditionalIndirect(OpaqueValue *destination,
                                         const void *targetKeyHashable) {
   abort();
 }
+
+SWIFT_CC(swift) SWIFT_RUNTIME_STDLIB_INTERNAL
+int _T0s13_getErrorCodeSiSPyxGs0B0RzlF(void *) {
+  abort();
+}
+
+SWIFT_CC(swift) SWIFT_RUNTIME_STDLIB_INTERNAL
+void *_T0s23_getErrorDomainNSStringyXlSPyxGs0B0RzlF(void *) {
+  abort();
+}
+
+SWIFT_CC(swift) SWIFT_RUNTIME_STDLIB_INTERNAL
+void *_T0s29_getErrorUserInfoNSDictionaryyXlSgSPyxGs0B0RzlF(void *) {
+  abort();
+}
+
+SWIFT_CC(swift) SWIFT_RUNTIME_STDLIB_INTERNAL
+void *_T0s32_getErrorEmbeddedNSErrorIndirectyXlSgSPyxGs0B0RzlF(void *) {
+  abort();
+}