Merge pull request #4213 from rjmccall/update-for-existential-layout-change-5.7

[5.7] Adjust to Swift API changes

Author: rjmccall

lldb/source/Plugins/TypeSystem/Swift/SwiftASTContext.cpp

@@ -5301,8 +5301,8 @@ bool SwiftASTContext::GetProtocolTypeInfo(const CompilerType &type,
     }
 
     unsigned num_witness_tables = 0;
-    for (auto protoTy : layout.getProtocols()) {
-      if (!protoTy->getDecl()->isObjC())
+    for (auto protoDecl : layout.getProtocols()) {
+      if (!protoDecl->isObjC())
         num_witness_tables++;
     }
 
@@ -6487,8 +6487,7 @@ GetExistentialTypeChild(swift::ASTContext *swift_ast_ctx, CompilerType type,
   swift::ExistentialLayout layout = swift_can_type.getExistentialLayout();
 
   std::string name;
-  for (auto protoType : layout.getProtocols()) {
-    auto proto = protoType->getDecl();
+  for (auto proto : layout.getProtocols()) {
     if (proto->isObjC())
       continue;