Introduce the ability to insert IACA (Intel Architecture Code Analyzer) marks to

src/IceAssemblerX86Base.h

Index: src/IceAssemblerX86Base.h
diff --git a/src/IceAssemblerX86Base.h b/src/IceAssemblerX86Base.h
index 917bd7bc1875ea9d7026284ca9098137338376f0..9031694d370249fda3d36f92e6d9a05a3178e399 100644
--- a/src/IceAssemblerX86Base.h
+++ b/src/IceAssemblerX86Base.h
@@ -832,6 +832,12 @@ public:
   void xchg(Type Ty, const typename Traits::Address &address,
             typename Traits::GPRRegister reg);
 
+  /// \name Intel Architecture Code Analyzer markers.
+  /// @{
+  void iaca_start();
+  void iaca_end();
+  /// @}
+
   void emitSegmentOverride(uint8_t prefix);
 
   intptr_t preferredLoopAlignment() { return 16; }