Subzero: Add necessary PNaCl files for standalone build.

pnacl-llvm/include/llvm/Bitcode/NaCl/NaClBitcodeDefs.h

+//===- NaClBitcodeDefs.h ----------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Defines some common types/constants used by bitcode readers and
+// writers. It is intended to make clear assumptions made in
+// representing bitcode files.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_BITCODE_NACL_NACLBITCODEDEFS_H
+#define LLVM_BITCODE_NACL_NACLBITCODEDEFS_H
+
+namespace llvm {
+
+namespace naclbitc {
+
+// Special record codes used to model codes for predefined records.
+// They are very large so that they do not conflict with existing
+// record codes for user-defined blocks.
+enum SpecialBlockCodes {
+  BLK_CODE_ENTER = 65535,
+  BLK_CODE_EXIT  = 65534,
+  BLK_CODE_DEFINE_ABBREV = 65533,
+  BLK_CODE_HEADER = 65532
+};
+
+} // end of namespace naclbitc
+
+/// Defines type for value indicies in bitcode. Like a size_t, but
+/// fixed across platforms.
+typedef uint32_t NaClBcIndexSize_t;
+
+/// Signed version of NaClBcIndexSize_t. Used to define relative indices.
+typedef int32_t NaClRelBcIndexSize_t;
+
+/// Defines maximum allowed bitcode index in bitcode files.
+static const size_t NaClBcIndexSize_t_Max =
+    std::numeric_limits<NaClBcIndexSize_t>::max();
+
+/// Defines the maximum number of initializers allowed, based on ILP32.
+static const size_t MaxNaClGlobalVarInits =
+    std::numeric_limits<uint32_t>::max();
+
+} // end of namespace llvm
+
+
+#endif // LLVM_BITCODE_NACL_NACLBITCODEDEFS_H