Fixed Unimplemented error in UnsafePointer test case

Author: vivkong

test/1_stdlib/UnsafePointer.swift.gyb

@@ -331,7 +331,7 @@ UnsafePointerTestSuite.test("customMirror") {
   expectEqual(1, mirror.children.count)
 #if arch(i386) || arch(arm)
   expectEqual("18446744071562067968", String(mirror.children.first!.1))
-#elseif arch(x86_64) || arch(arm64) || arch(powerpc64) || arch(powerpc64le)
+#elseif arch(x86_64) || arch(arm64) || arch(powerpc64) || arch(powerpc64le) || arch(s390x)
   expectEqual("9223372036854775808", String(mirror.children.first!.1))
 #else
   fatalError("Unimplemented")
@@ -346,7 +346,7 @@ UnsafePointerTestSuite.test("customPlaygroundQuickLook") {
   if case let .text(desc) = ptr.customPlaygroundQuickLook {
 #if arch(i386) || arch(arm)
     expectEqual("UnsafePointer(0xFFFFFFFF80000000)", desc)
-#elseif arch(x86_64) || arch(arm64) || arch(powerpc64) || arch(powerpc64le)
+#elseif arch(x86_64) || arch(arm64) || arch(powerpc64) || arch(powerpc64le) || arch(s390x)
     expectEqual("UnsafePointer(0x8000000000000000)", desc)
 #else
     fatalError("Unimplemented")
@@ -363,7 +363,7 @@ UnsafeMutablePointerTestSuite.test("customMirror") {
   expectEqual(1, mirror.children.count)
 #if arch(i386) || arch(arm)
   expectEqual("18446744071562067968", String(mirror.children.first!.1))
-#elseif arch(x86_64) || arch(arm64) || arch(powerpc64) || arch(powerpc64le)
+#elseif arch(x86_64) || arch(arm64) || arch(powerpc64) || arch(powerpc64le) || arch(s390x)
   expectEqual("9223372036854775808", String(mirror.children.first!.1))
 #else
   fatalError("Unimplemented")
@@ -377,7 +377,7 @@ UnsafeMutablePointerTestSuite.test("customPlaygroundQuickLook") {
   if case let .text(desc) = ptr.customPlaygroundQuickLook {
 #if arch(i386) || arch(arm)
     expectEqual("UnsafeMutablePointer(0xFFFFFFFF80000000)", desc)
-#elseif arch(x86_64) || arch(arm64) || arch(powerpc64) || arch(powerpc64le)
+#elseif arch(x86_64) || arch(arm64) || arch(powerpc64) || arch(powerpc64le) || arch(s390x)
     expectEqual("UnsafeMutablePointer(0x8000000000000000)", desc)
 #else
     fatalError("Unimplemented")