Revert "Merge pull request swiftlang#6302 from CodaFi/pattern-ity"

This reverts commit ad21e5f, reversing
changes made to dbc832b.

Author: jrose-apple

lib/Parse/ConditionResolver.cpp

@@ -282,14 +282,6 @@ namespace {
         for (auto condition : configsToResolve) {
           R.resolveClausesAndInsertMembers(IDC, condition);
         }
-      } else if (auto *PBD = dyn_cast<PatternBindingDecl>(D)) {
-        PBD->walk(R.NDF);
-        for (unsigned i = 0, e = PBD->getNumPatternEntries(); i != e; ++i) {
-          if (auto e = PBD->getInit(i)) {
-            PBD->setInit(i,
-                         e->walk(const_cast<ASTWalker&>(R.getClosureFinder())));
-          }
-        }
       }
       return true;
     }

test/Parse/ConditionalCompilation/can_import.swift

@@ -94,19 +94,3 @@ func performPerOS() -> Int {
   return performFoo(withX: value, andY: value)
 }
 #endif
-
-let osName: String = {
-#if os(iOS)
-  return "iOS"
-#elseif os(watchOS)
-  return "watchOS"
-#elseif os(tvOS)
-  return "tvOS"
-#elseif os(OSX)
-  return "OS X"
-#elseif os(Linux)
-  return "Linux"
-#else
-  return "Unknown"
-#endif
-}()