LLVMCodeGen: Update libdeps corresponding to r246236.

llvm-svn: 246274
diff --git a/llvm/lib/CodeGen/LLVMBuild.txt b/llvm/lib/CodeGen/LLVMBuild.txt
index 18ed776..69b6a0f 100644
--- a/llvm/lib/CodeGen/LLVMBuild.txt
+++ b/llvm/lib/CodeGen/LLVMBuild.txt
@@ -22,4 +22,4 @@
 type = Library
 name = CodeGen
 parent = Libraries
-required_libraries = Analysis Core Instrumentation MC Scalar Support Target TransformUtils
+required_libraries = Analysis BitReader BitWriter Core Instrumentation MC Scalar Support Target TransformUtils