Add a few Subzero intrinsics (not the atomic ones yet).

src/IceIntrinsics.h

Index: src/IceIntrinsics.h
diff --git a/src/IceIntrinsics.h b/src/IceIntrinsics.h
new file mode 100644
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+++ b/src/IceIntrinsics.h
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+//===- subzero/src/IceIntrinsics.h - List of Ice Intrinsics -----*- 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 kinds of intrinsics supported by PNaCl.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SUBZERO_SRC_ICEINTRINSICS_H
+#define SUBZERO_SRC_ICEINTRINSICS_H
+
+#include "IceDefs.h"
+
+namespace Ice {
+
+// Some intrinsics allow overloading by type. This enum collapses all
+// overloads into a single ID, but the type can still be recovered by the
+// type of the intrinsic function call's return value and parameters.
+enum IntrinsicID {
+  UnknownIntrinsic = 0,
+  // Arbitrary (alphabetical) order.
+  AtomicCmpxchg,
+  AtomicFence,
+  AtomicFenceAll,
+  AtomicIsLockFree,
+  AtomicLoad,
+  AtomicRMW,
+  AtomicStore,
+  Bswap,
+  Ctlz,
+  Ctpop,
+  Cttz,
+  Longjmp,
+  Memcpy,
+  Memmove,
+  Memset,
+  NaClReadTP,
+  Setjmp,
+  Sqrt,
+  Stacksave,
+  Stackrestore,
+  Trap
+};
+
+// Basic attributes related to each intrinsic. We may want to have more
+// attributes (e.g., Setjmp returns twice) once the lowering cares
+// about such attributes, and the attributes representation that can be
+// shared with general function calls.
+struct IntrinsicInfo {
+  IntrinsicID ID : 16;
+  bool HasSideEffects : 1;
+};
+bool operator==(const IntrinsicInfo &A, const IntrinsicInfo &B);
+
+extern const IntrinsicInfo UnknownIntrinsicInfo;
+
+// TODO(jvoung): May want to switch to something like LLVM's StringMap.
+typedef std::map<IceString, IntrinsicInfo> IntrinsicMap;
+
+// Fills/Turns OutMap into a map from intrinsic name (e.g.,
+// "nacl.atomic.load.i8") into the intrinsic's information. The map assumes
+// that the "llvm." prefix has been stripped from the function name already.
+void BuildIntrinsicMap(IntrinsicMap *OutMap);
+
+} // end of namespace Ice
+
+#endif // SUBZERO_SRC_ICEINTRINSICS_H