Copy Bitwriter to generate PNaClBitwriter.

tools/pnacl-freeze/LLVMBuild.txt

Index: tools/pnacl-freeze/LLVMBuild.txt
diff --git a/tools/llvm-ar/LLVMBuild.txt b/tools/pnacl-freeze/LLVMBuild.txt
similarity index 59%
copy from tools/llvm-ar/LLVMBuild.txt
copy to tools/pnacl-freeze/LLVMBuild.txt
index 1f61a32014887535a130b9be5f6dcf0ad6f04f42..8b29b897acbd5274f56117778caeeeccd4c94a4d 100644
--- a/tools/llvm-ar/LLVMBuild.txt
+++ b/tools/pnacl-freeze/LLVMBuild.txt
@@ -1,10 +1,4 @@
-;===- ./tools/llvm-ar/LLVMBuild.txt ----------------------------*- Conf -*--===;
-;
-;                     The LLVM Compiler Infrastructure
-;
-; This file is distributed under the University of Illinois Open Source
-; License. See LICENSE.TXT for details.
-;
+;===- ./tools/pnacl-freeze/LLVMBuild.txt -----------------------*- Conf -*--===;
 ;===------------------------------------------------------------------------===;
 ;
 ; This is an LLVMBuild description file for the components in this subdirectory.
@@ -17,6 +11,6 @@
 
 [component_0]
 type = Tool
-name = llvm-ar
+name = pnacl-freeze
 parent = Tools
-required_libraries = Archive
+required_libraries = AsmParser PNaClBitWriter Analysis BitReader