Copy Bitwriter to generate PNaClBitwriter.

Copy classes for LLVM BitcodeWriter into a PNaCL subdirectory, to create a
PNaCL version. Renames classes/methods to include PNaCl prefix so that they
don't conflict with the LLVM BitcodeWriter.

Also removed experimental support for use-list order
preservation.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3405

Review URL: https://codereview.chromium.org/14126011

Author: KarlSchimpf

include/llvm/Bitcode/NaCl/NaClBitstreamWriter.h

@@ -0,0 +1,29 @@
+//===-- llvm/Bitcode/NaCl/NaClReaderWriter.h - ------------------*- C++ -*-===//
+//      NaCl Bitcode reader/writer.
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This header defines interfaces to read and write LLVM bitcode files/streams.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_BITCODE_NACL_NACLREADERWRITER_H
+#define LLVM_BITCODE_NACL_NACLREADERWRITER_H
+
+namespace llvm {
+  class Module;
+  class raw_ostream;
+
+  /// NaClWriteBitcodeToFile - Write the specified module to the
+  /// specified raw output stream, using PNaCl wire format.  For
+  /// streams where it matters, the given stream should be in "binary"
+  /// mode.
+  void NaClWriteBitcodeToFile(const Module *M, raw_ostream &Out);
+
+} // end llvm namespace
+#endif

include/llvm/Bitcode/NaCl/NaClReaderWriter.h

@@ -1,2 +1,3 @@
 add_subdirectory(Reader)
 add_subdirectory(Writer)
+add_subdirectory(NaCl)

lib/Bitcode/CMakeLists.txt

@@ -16,7 +16,7 @@
 ;===------------------------------------------------------------------------===;
 
 [common]
-subdirectories = Reader Writer
+subdirectories = Reader Writer NaCl
 
 [component_0]
 type = Group

lib/Bitcode/LLVMBuild.txt

@@ -8,7 +8,7 @@
 ##===----------------------------------------------------------------------===##
 
 LEVEL = ../..
-PARALLEL_DIRS = Reader Writer
+PARALLEL_DIRS = Reader Writer NaCl
 
 include $(LEVEL)/Makefile.common
 

lib/Bitcode/Makefile

@@ -0,0 +1 @@
+add_subdirectory(Writer)

lib/Bitcode/NaCl/CMakeLists.txt

@@ -0,0 +1,24 @@
+;===- ./lib/Bitcode/NaCl/LLVMBuild.txt ------------------------*- Conf -*--===;
+;
+;                     The LLVM Compiler Infrastructure
+;
+; This file is distributed under the University of Illinois Open Source
+; License. See LICENSE.TXT for details.
+;
+;===------------------------------------------------------------------------===;
+;
+; This is an LLVMBuild description file for the components in this subdirectory.
+;
+; For more information on the LLVMBuild system, please see:
+;
+;   http://llvm.org/docs/LLVMBuild.html
+;
+;===------------------------------------------------------------------------===;
+
+[common]
+subdirectories = Writer
+
+[component_0]
+type = Group
+name = NaClBitcode
+parent = Bitcode

lib/Bitcode/NaCl/LLVMBuild.txt

@@ -0,0 +1,14 @@
+##===- lib/Bitcode/NaCl/Makefile ---------------------------*- Makefile -*-===##
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+##===----------------------------------------------------------------------===##
+
+LEVEL = ../../..
+PARALLEL_DIRS = Writer
+
+include $(LEVEL)/Makefile.common
+

lib/Bitcode/NaCl/Makefile

@@ -0,0 +1,5 @@
+add_llvm_library(NaClBitWriter
+  NaClBitcodeWriter.cpp
+  NaClValueEnumerator.cpp
+  )
+add_dependencies(NaClBitWriter intinsics_gen)

lib/Bitcode/NaCl/Writer/CMakeLists.txt

@@ -0,0 +1,22 @@
+;===- ./lib/Bitcode/NaCl/Writer/LLVMBuild.txt -----------------*- Conf -*--===;
+;
+;                     The LLVM Compiler Infrastructure
+;
+; This file is distributed under the University of Illinois Open Source
+; License. See LICENSE.TXT for details.
+;
+;===------------------------------------------------------------------------===;
+;
+; This is an LLVMBuild description file for the components in this subdirectory.
+;
+; For more information on the LLVMBuild system, please see:
+;
+;   http://llvm.org/docs/LLVMBuild.html
+;
+;===------------------------------------------------------------------------===;
+
+[component_0]
+type = Library
+name = NaClBitWriter
+parent = NaClBitcode
+required_libraries = Core Support