[overlay] Hide the _ExpressibleByColorLiteral initializer from code completion.

Fixes: <rdar://problem/32726800>

lib/Sema/TypeChecker.cpp

@@ -172,7 +172,7 @@ DeclName TypeChecker::getObjectLiteralConstructorName(ObjectLiteralExpr *expr) {
   switch (expr->getLiteralKind()) {
   case ObjectLiteralExpr::colorLiteral: {
     return DeclName(Context, Context.Id_init,
-                    { Context.getIdentifier("colorLiteralRed"),
+                    { Context.getIdentifier("_colorLiteralRed"),
                       Context.getIdentifier("green"),
                       Context.getIdentifier("blue"),
                       Context.getIdentifier("alpha") });

stdlib/public/SDK/AppKit/AppKit.swift

@@ -79,7 +79,7 @@ extension NSApplication {
 
 extension NSColor : _ExpressibleByColorLiteral {
   @nonobjc
-  public required convenience init(colorLiteralRed red: Float, green: Float,
+  public required convenience init(_colorLiteralRed red: Float, green: Float,
                                    blue: Float, alpha: Float) {
     self.init(srgbRed: CGFloat(red), green: CGFloat(green),
               blue: CGFloat(blue), alpha: CGFloat(alpha))

stdlib/public/SDK/CoreGraphics/CoreGraphics.swift

@@ -53,7 +53,7 @@ public protocol _CGColorInitTrampoline {
 }
 
 extension _CGColorInitTrampoline {
-  public init(colorLiteralRed red: Float, green: Float, blue: Float,
+  public init(_colorLiteralRed red: Float, green: Float, blue: Float,
               alpha: Float) {
     self.init(red: CGFloat(red), green: CGFloat(green), blue: CGFloat(blue),
               alpha: CGFloat(alpha))

stdlib/public/SDK/UIKit/UIKit.swift

@@ -216,7 +216,7 @@ extension UIView : _DefaultCustomPlaygroundQuickLookable {
 #endif
 
 extension UIColor : _ExpressibleByColorLiteral {
-  @nonobjc public required convenience init(colorLiteralRed red: Float,
+  @nonobjc public required convenience init(_colorLiteralRed red: Float,
                                             green: Float,
                                             blue: Float, alpha: Float) {
     self.init(red: CGFloat(red), green: CGFloat(green),

stdlib/public/core/CompilerProtocols.swift

@@ -744,7 +744,7 @@ public protocol _ExpressibleByColorLiteral {
   ///
   /// Do not call this initializer directly. Instead, initialize a variable or
   /// constant using a color literal.
-  init(colorLiteralRed red: Float, green: Float, blue: Float, alpha: Float)
+  init(_colorLiteralRed red: Float, green: Float, blue: Float, alpha: Float)
 }
 
 /// A type that can be initialized using an image literal (e.g.

test/IDE/complete_literal.swift

@@ -62,7 +62,7 @@ func giveMeAString() -> Int {
 // LITERAL5-DAG:     Decl[InstanceMethod]/CurrNominal/NotRecommended/TypeRelation[Invalid]: append({#contentsOf: Sequence#})[#Void#]{{; name=.+$}}
 
 struct MyColor: _ExpressibleByColorLiteral {
-  init(colorLiteralRed: Float, green: Float, blue: Float, alpha: Float) { red = colorLiteralRed }
+  init(_colorLiteralRed: Float, green: Float, blue: Float, alpha: Float) { red = colorLiteralRed }
   var red: Float
 }
 public typealias _ColorLiteralType = MyColor

test/IDE/complete_value_literals.swift

@@ -201,7 +201,7 @@ func testTuple2() {
 // TUPLE_2: Literal[Tuple]/None/TypeRelation[Identical]: ({#(values)#})[#(MyInt1, MyString1, MyDouble1)#];
 
 struct MyColor1: _ExpressibleByColorLiteral {
-  init(colorLiteralRed: Float, green: Float, blue: Float, alpha: Float) {}
+  init(_colorLiteralRed: Float, green: Float, blue: Float, alpha: Float) {}
 }
 func testColor0() {
   let x: Int = #^COLOR_0^#

test/IDE/structure_object_literals.swift

@@ -1,7 +1,7 @@
 // RUN: %swift-ide-test -structure -source-filename %s | %FileCheck %s
 
 struct S: _ExpressibleByColorLiteral {
-  init(colorLiteralRed: Float, green: Float, blue: Float, alpha: Float) {}
+  init(_colorLiteralRed: Float, green: Float, blue: Float, alpha: Float) {}
 }
 
 // CHECK: <gvar>let <name>y</name>: S = <object-literal-expression>#<name>colorLiteral</name>(<arg><name>red</name>: 1</arg>, <arg><name>green</name>: 0</arg>, <arg><name>blue</name>: 0</arg>, <arg><name>alpha</name>: 1</arg>)</object-literal-expression></gvar>

test/Sema/object_literals_ios.swift

@@ -2,7 +2,7 @@
 // REQUIRES: OS=ios
 
 struct S: _ExpressibleByColorLiteral {
-  init(colorLiteralRed: Float, green: Float, blue: Float, alpha: Float) {}
+  init(_colorLiteralRed: Float, green: Float, blue: Float, alpha: Float) {}
 }
 
 let y: S = #colorLiteral(red: 1, green: 0, blue: 0, alpha: 1)

test/Sema/object_literals_osx.swift

@@ -2,7 +2,7 @@
 // REQUIRES: OS=macosx
 
 struct S: _ExpressibleByColorLiteral {
-  init(colorLiteralRed: Float, green: Float, blue: Float, alpha: Float) {}
+  init(_colorLiteralRed: Float, green: Float, blue: Float, alpha: Float) {}
 }
 
 let y: S = #colorLiteral(red: 1, green: 0, blue: 0, alpha: 1)