stdlib: always inline the Set/Dictionary's _bucket function

If the Key is a class, then FunctionSignatureOpts cannot convert it to a @guaranteed parameter.
Using the new EpilogueARCAnalysis in FunctionSignatureOpts should fix that.

Author: eeckstein

stdlib/public/core/HashedCollections.swift.gyb

@@ -2804,6 +2804,7 @@ struct _Native${Self}Storage<${TypeParametersDecl}> :
   }
 
   @_versioned
+  @inline(__always) // For performance reasons.
   internal func _bucket(_ k: Key) -> Int {
     return _squeezeHashValue(k.hashValue, capacity)
   }