Swift SIL: make BasicBlock Equatable

Author: eeckstein

SwiftCompilerSources/Sources/SIL/BasicBlock.swift

@@ -14,7 +14,7 @@ import Basic
 import SILBridging
 
 @_semantics("arc.immortal")
-final public class BasicBlock : CustomStringConvertible, HasShortDescription {
+final public class BasicBlock : CustomStringConvertible, HasShortDescription, Equatable {
   public var next: BasicBlock? { bridged.getNext().block }
   public var previous: BasicBlock? { bridged.getPrevious().block }
 
@@ -65,12 +65,11 @@ final public class BasicBlock : CustomStringConvertible, HasShortDescription {
 
   public var name: String { "bb\(index)" }
 
+  public static func == (lhs: BasicBlock, rhs: BasicBlock) -> Bool { lhs === rhs }
+
   public var bridged: BridgedBasicBlock { BridgedBasicBlock(SwiftObject(self)) }
 }
 
-public func == (lhs: BasicBlock, rhs: BasicBlock) -> Bool { lhs === rhs }
-public func != (lhs: BasicBlock, rhs: BasicBlock) -> Bool { lhs !== rhs }
-
 /// The list of instructions in a BasicBlock.
 ///
 /// It's allowed to delete the current, next or any other instructions while