Subzero: Fix and clean up some cross tests.

crosstest/vectors.h

 //===- subzero/crosstest/vectors.h - Common SIMD vector utilies -*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file provides declarations for PNaCl portable SIMD vector types. In
 // addition, this file provides utilies that may be useful for crosstesting
 // vector code.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef VECTORS_H
 #define VECTORS_H
 
 #include <stdint.h>
 #include <string>
 #include <sstream>
 
+// The driver and the test program may be compiled by different
+// versions of clang, with different standard libraries that have
+// different definitions of int8_t.  Specifically, int8_t may be
+// typedef'd as either 'char' or 'signed char', which mangle to
+// different strings.  Avoid int8_t and use an explicit myint8_t.
+typedef signed char myint8_t;
+
 #include "vectors.def"
 
 // PNaCl portable vector types
 // Types declared: v4si32, v4ui32, v8si16, v8ui16, v16si8, v16ui8, v4f32
 #define X(ty, eltty, castty) typedef eltty ty __attribute__((vector_size(16)));
 VECTOR_TYPE_TABLE
 #undef X
 
 // i1 vector types are not native C++ SIMD vector types. Instead, for
 // testing, they are expanded by the test code into native 128 bit
@@ skipping 68 matching lines @@
     return State;
   }
 
 private:
   uint32_t State;
 };
 
 } // end anonymous namespace
 
 #endif // VECTORS_H