[stdlib] Re-add previously synthesized hashing definitions

Author: lorentey

stdlib/public/core/FloatingPoint.swift

@@ -1237,6 +1237,19 @@ public enum FloatingPointSign: Int {
   public static func ==(a: FloatingPointSign, b: FloatingPointSign) -> Bool {
     return a.rawValue == b.rawValue
   }
+
+  @inlinable
+  public var hashValue: Int { return rawValue.hashValue }
+
+  @inlinable
+  public func hash(into hasher: inout Hasher) {
+    hasher.combine(rawValue)
+  }
+
+  @inlinable
+  public func _rawHashValue(seed: Int) -> Int {
+    return rawValue._rawHashValue(seed: seed)
+  }
 }
 
 /// The IEEE 754 floating-point classes.

stdlib/public/core/UnicodeScalarProperties.swift

@@ -1258,12 +1258,27 @@ extension Unicode {
       self.rawValue = rawValue
     }
 
+    public static func == (
+      lhs: CanonicalCombiningClass,
+      rhs: CanonicalCombiningClass
+    ) -> Bool {
+      return lhs.rawValue == rhs.rawValue
+    }
+
     public static func < (
       lhs: CanonicalCombiningClass,
       rhs: CanonicalCombiningClass
     ) -> Bool {
       return lhs.rawValue < rhs.rawValue
     }
+
+    public var hashValue: Int {
+      return rawValue.hashValue
+    }
+
+    public func hash(into hasher: inout Hasher) {
+      hasher.combine(rawValue)
+    }
   }
 }