Subzero: Add a random number generator.

src/IceGlobalContext.cpp

 //===- subzero/src/IceGlobalContext.cpp - Global context defs ---*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file defines aspects of the compilation that persist across
@@ skipping 102 matching lines @@
   TypePool<RelocatableTuple, ConstantRelocatable> Relocatables;
   UndefPool Undefs;
 };
 
 GlobalContext::GlobalContext(llvm::raw_ostream *OsDump,
                              llvm::raw_ostream *OsEmit, VerboseMask Mask,
                              TargetArch Arch, OptLevel Opt,
                              IceString TestPrefix, const ClFlags &Flags)
     : StrDump(OsDump), StrEmit(OsEmit), VMask(Mask),
       ConstPool(new ConstantPool()), Arch(Arch), Opt(Opt),
-      TestPrefix(TestPrefix), Flags(Flags), HasEmittedFirstMethod(false) {}
+      TestPrefix(TestPrefix), Flags(Flags), HasEmittedFirstMethod(false),
+      RNG("") {}
 
 // Scan a string for S[0-9A-Z]*_ patterns and replace them with
 // S<num>_ where <num> is the next base-36 value.  If a type name
 // legitimately contains that pattern, then the substitution will be
 // made in error and most likely the link will fail.  In this case,
 // the test classes can be rewritten not to use that pattern, which is
 // much simpler and more reliable than implementing a full demangling
 // parser.  Another substitution-in-error may occur if a type
 // identifier ends with the pattern S[0-9A-Z]*, because an immediately
 // following substitution string like "S1_" or "PS1_" may be combined
@@ skipping 241 matching lines @@
 
 void Timer::printElapsedUs(GlobalContext *Ctx, const IceString &Tag) const {
   if (Ctx->isVerbose(IceV_Timing)) {
     // Prefixing with '#' allows timing strings to be included
     // without error in textual assembly output.
     Ctx->getStrDump() << "# " << getElapsedUs() << " usec " << Tag << "\n";
   }
 }
 
 } // end of namespace Ice