Add initial integrated assembler w/ some Xmm ops.

src/IceFixups.h

+//===- subzero/src/IceFixups.h - Assembler fixup kinds ----------*- 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 generic fixup types.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SUBZERO_SRC_ICEFIXUPS_H
+#define SUBZERO_SRC_ICEFIXUPS_H
+
+#include "IceTypes.def"
+
+namespace Ice {
+
+enum FixupKind {
+  // Specify some of the most common relocation types.
+  FK_Abs_4 = 0,
+  FK_PcRel_4 = 1,
+
+  // Target specific relocation types follow this.
+  FK_FirstTargetSpecific = 1 << 4
+};
+
+} // end of namespace Ice
+
+#endif // SUBZERO_SRC_ICEFIXUPS_H