Subzero: Add locking to prepare for multithreaded translation.

src/IceOperand.h

 //===- subzero/src/IceOperand.h - High-level operands -----------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares the Operand class and its target-independent
@@ skipping 507 matching lines @@
   // VarsReal (and Operand::Vars) are set up such that Vars[0] ==
   // this.
   Variable *VarsReal[1];
 };
 
 enum MetadataKind {
   VMK_Uses,       // Track only uses, not defs
   VMK_SingleDefs, // Track uses+defs, but only record single def
   VMK_All         // Track uses+defs, including full def list
 };
-typedef std::vector<const Inst *, CfgLocalAllocator<const Inst *> > InstDefList;
+typedef std::vector<const Inst *, CfgLocalAllocator<const Inst *>> InstDefList;
 
 // VariableTracking tracks the metadata for a single variable.  It is
 // only meant to be used internally by VariablesMetadata.
 class VariableTracking {
   VariableTracking &operator=(const VariableTracking &) = delete;
 
 public:
   enum MultiDefState {
     // TODO(stichnot): Consider using just a simple counter.
     MDS_Unknown,
@@ skipping 86 matching lines @@
 private:
   const Cfg *Func;
   MetadataKind Kind;
   std::vector<VariableTracking> Metadata;
   const static InstDefList NoDefinitions;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEOPERAND_H