Subzero: Add Non-SFI support for x86-32.

crosstest/test_global_main.cpp

 //===- subzero/crosstest/test_global_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 global variable access operations.
@@ skipping 21 matching lines @@
   double d;
 };
 
 struct Data SimpleData = {-111, 2.69, 55.19};
 
 struct Data *ExternName4 = &SimpleData;
 
 double ExternName5 = 3.44e26;
 
 int main(int argc, char **argv) {
+  // Prevent pnacl-opt from deleting "unused" globals.
+  if (argc < 0) {
+    std::cout << &ExternName1 << &ExternName2 << &ExternName3 << &SimpleData
+              << &ExternName4 << ExternName5;
+  }
   size_t TotalTests = 0;
   size_t Passes = 0;
   size_t Failures = 0;
 
   const uint8_t *SzArray, *LlcArray;
   size_t SzArrayLen, LlcArrayLen;
 
   size_t NumArrays = getNumArrays();
   for (size_t i = 0; i < NumArrays; ++i) {
     LlcArrayLen = -1;
@@ skipping 18 matching lines @@
         std::cout << i << ":LlcArray[" << i << "] = " << (int)LlcArray[i]
                   << ", SzArray[" << i << "] = " << (int)SzArray[i] << "\n";
       }
     }
   }
 
   std::cout << "TotalTests=" << TotalTests << " Passes=" << Passes
             << " Failures=" << Failures << "\n";
   return Failures;
 }