Merge pull request #71656 from rjmccall/isolated-any-mangling-reconstruction-2

Fix another bug with type reconstruction of `@isolated(any)` types

Author: DougGregor

include/swift/Demangling/TypeDecoder.h

@@ -293,7 +293,7 @@ class ImplFunctionTypeFlags {
                         bool erasedIsolation,
                         ImplFunctionDifferentiabilityKind diffKind)
       : Rep(unsigned(rep)), Pseudogeneric(pseudogeneric), Escaping(noescape),
-        Concurrent(concurrent), Async(async),
+        Concurrent(concurrent), Async(async), ErasedIsolation(erasedIsolation),
         DifferentiabilityKind(unsigned(diffKind)) {}
 
   ImplFunctionTypeFlags