Subzero: The cross tests should use the actual Subzero runtime.

crosstest/test_vector_ops_main.cpp

 //===- subzero/crosstest/test_vector_ops_main.cpp - Driver for tests ------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // Driver for crosstesting insertelement and extractelement operations
@@ skipping 144 matching lines @@
   testExtractElement<v8ui16>(TotalTests, Passes, Failures);
   testExtractElement<v4si32>(TotalTests, Passes, Failures);
   testExtractElement<v4ui32>(TotalTests, Passes, Failures);
   testExtractElement<v4f32>(TotalTests, Passes, Failures);
 
   std::cout << "TotalTests=" << TotalTests << " Passes=" << Passes
             << " Failures=" << Failures << "\n";
 
   return Failures;
 }
-
-extern "C" {
-
-void ice_unreachable(void) {
-  std::cerr << "\"unreachable\" instruction encountered\n";
-  abort();
-}
-}