Make SwiftValue == support unconditional

PR #71620 made this behavior conditional as a way to help
provide binary compatibility for legacy software that might
be relying on the old behavior.

So far, it appears the only such problems arose from the
SwiftObject behavior changes, not from SwiftValue behavior.
So let's optimistically back this out and make the new behavior
unconditional.

Resolves rdar://127839540

Author: tbkka

stdlib/public/runtime/SwiftValue.mm

@@ -430,10 +430,10 @@ - (BOOL)isEqual:(id)other {
     }
   }
 
-  if (runtime::bincompat::useLegacySwiftObjCHashing()) {
-    // Legacy behavior only proxies isEqual: for Hashable, not Equatable
-    return NO;
-  }
+//  if (runtime::bincompat::useLegacySwiftObjCHashing()) {
+//    // Legacy behavior only proxies isEqual: for Hashable, not Equatable
+//    return NO;
+//  }
 
   if (auto equatableConformance = selfHeader->getEquatableConformance()) {
     if (auto selfEquatableBaseType = selfHeader->getEquatableBaseType()) {
@@ -464,10 +464,10 @@ - (NSUInteger)hash {
 	    selfHeader->type, hashableConformance);
   }
 
-  if (runtime::bincompat::useLegacySwiftObjCHashing()) {
-    // Legacy behavior doesn't honor Equatable conformance, only Hashable
-    return (NSUInteger)self;
-  }
+//  if (runtime::bincompat::useLegacySwiftObjCHashing()) {
+//    // Legacy behavior doesn't honor Equatable conformance, only Hashable
+//    return (NSUInteger)self;
+//  }
 
   // If Swift type is Equatable but not Hashable,
   // we have to return something here that is compatible