Use -mc-relax-all flag for sandboxed translator

tools/pnacl-llc/pnacl-llc.cpp

 //===-- pnacl-llc.cpp - PNaCl-specific llc: pexe ---> nexe  ---------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // pnacl-llc: the core of the PNaCl translator, compiling a pexe into a nexe.
@@ skipping 734 matching lines @@
   const Target *TheTarget = TargetRegistry::lookupTarget(MArch, TheTriple,
                                                          Error);
   if (!TheTarget) {
     errs() << ProgramName << ": " << Error;
     return 1;
   }
 
   TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
   Options.DisableIntegratedAS = NoIntegratedAssembler;
   Options.MCOptions.AsmVerbose = true;
+#if defined(__native_client__)
+  // This enables LLVM MC to write instruction padding directly into fragments
+  // reducing memory usage of the translator. However, this could result in
+  // suboptimal machine code since we cannot use short jumps where possible
+  // which is why we enable this for sandboxed translator case.
+  Options.MCOptions.MCRelaxAll = true;
+#endif
 
   if (GenerateSoftFloatCalls)
     FloatABIForCalls = FloatABI::Soft;
 
   // Package up features to be passed to target/subtarget
   std::string FeaturesStr;
   if (MAttrs.size()) {
     SubtargetFeatures Features;
     for (unsigned i = 0; i != MAttrs.size(); ++i)
       Features.AddFeature(MAttrs[i]);
@@ skipping 51 matching lines @@
   return 0;
 }
 
 int main(int argc, char **argv) {
 #if defined(PNACL_BROWSER_TRANSLATOR)
   return srpc_main(argc, argv);
 #else
   return llc_main(argc, argv);
 #endif // PNACL_BROWSER_TRANSLATOR
 }