[Gardening] Remove DoubleWidth dead code from test

Author: palimondo

test/Constraints/diagnostics_swift4.swift

@@ -54,5 +54,3 @@ class R<K: Hashable, V> {
 infix operator +=+ : AdditionPrecedence
 func +=+(_ lhs: Int, _ rhs: Int) -> Bool { return lhs == rhs }
 func +=+<T: BinaryInteger>(_ lhs: T, _ rhs: Int) -> Bool { return lhs == rhs }
-// FIXME: DoubleWidth is no longer part of the standard library
-// let _ = DoubleWidth<Int>(Int.min) - 1 +=+ Int.min // Ok

test/stdlib/FloatingPoint.swift.gyb

@@ -112,14 +112,6 @@ FloatingPoint.test("BinaryFloatingPoint/genericIntegerConversion") {
   expectEqual(Float._convert(from: Int64.max).value, Float(Int64.max))
   expectEqual(Float._convert(from: Int64.min).value, Float(Int64.min))
 
-// FIXME: DoubleWidth is no longer part of the standard library
-#if false
-  expectEqual(Float._convert(from: DoubleWidth<UInt64>.max).value, .infinity)
-  expectEqual(
-    Float._convert(from: DoubleWidth<DoubleWidth<Int64>>.max).value, .infinity)
-  expectEqual(
-    Float._convert(from: DoubleWidth<DoubleWidth<Int64>>.min).value, -.infinity)
-#endif
 }
 
 FloatingPoint.test("BinaryFloatingPoint/genericFloatingPointConversion") {

test/stdlib/Integers.swift.gyb

@@ -914,18 +914,6 @@ tests.test("binaryLogarithm/generic") {
   expectEqual(
     (42 as MockBinaryInteger<UInt>)._binaryLogarithm(),
     (42 as UInt)._binaryLogarithm())
-// FIXME: DoubleWidth is no longer part of the standard library
-#if false
-  expectEqual(
-    (42 as MockBinaryInteger<DoubleWidth<Int>>)._binaryLogarithm(),
-    (42 as DoubleWidth<Int>)._binaryLogarithm())
-  expectEqual(
-    (42 as MockBinaryInteger<DoubleWidth<UInt>>)._binaryLogarithm(),
-    (42 as DoubleWidth<UInt>)._binaryLogarithm())
-  expectEqual(
-    (42 as MockBinaryInteger<DoubleWidth<DoubleWidth<Int>>>)._binaryLogarithm(),
-    (42 as DoubleWidth<DoubleWidth<Int>>)._binaryLogarithm())
-#endif
 }
 
 runAllTests()