AST: Remove isSwiftVersion3()

Author: slavapestov

include/swift/AST/ASTContext.h

@@ -924,9 +924,6 @@ class ASTContext final {
   CanGenericSignature getExistentialSignature(CanType existential,
                                               ModuleDecl *mod);
 
-  /// Whether our effective Swift version is in the Swift 3 family.
-  bool isSwiftVersion3() const { return LangOpts.isSwiftVersion3(); }
-
   /// Whether our effective Swift version is at least 'major'.
   ///
   /// This is usually the check you want; for example, when introducing

include/swift/Basic/LangOptions.h

@@ -358,11 +358,6 @@ namespace swift {
       return CustomConditionalCompilationFlags;
     }
 
-    /// Whether our effective Swift version is in the Swift 3 family
-    bool isSwiftVersion3() const {
-      return EffectiveLanguageVersion.isVersion3();
-    }
-
     /// Whether our effective Swift version is at least 'major'.
     ///
     /// This is usually the check you want; for example, when introducing

include/swift/Basic/Version.h

@@ -107,9 +107,6 @@ class Version {
   /// compiler to act as if it is version 3.1.
   Optional<Version> getEffectiveLanguageVersion() const;
 
-  /// Whether this version is in the Swift 3 family
-  bool isVersion3() const { return !empty() && Components[0] == 3; }
-
   /// Whether this version is greater than or equal to the given major version
   /// number.
   bool isVersionAtLeast(unsigned major, unsigned minor = 0) const {