Merge pull request swiftlang#1814 from compnerd/disabled

Tests: reduce enabled tests on Linux

Author: shahmishal

Tests/SwiftDriverTests/SwiftDriverTests.swift

@@ -2758,6 +2758,7 @@ final class SwiftDriverTests: XCTestCase {
  }
 #endif
 
+ #if os(macOS) || os(Windows)
  do {
  // undefined behavior sanitizer
  var driver = try Driver(args: commonArgs + ["-sanitize=undefined"])
@@ -2816,6 +2817,7 @@ final class SwiftDriverTests: XCTestCase {
  XCTAssertTrue(linkCmd.contains(.flag("-fsanitize=scudo")))
  }
  #endif
+ #endif
 
  // FIXME: This test will fail when not run on Android, because the driver uses
  // the existence of the runtime support libraries to determine if