Add support for BitWriter_2_9_func bitcode writing.

This allows us to generate Bitcode for pre-3.0 LLVM using the old opcode for
TYPE_CODE_FUNCTION (renamed to TYPE_CODE_FUNCTION_OLD).

Change-Id: I5b88bff6224658f3e50940bb6f46aa13ca40c080
diff --git a/Android.mk b/Android.mk
index a783ba9..ba2915e 100644
--- a/Android.mk
+++ b/Android.mk
@@ -40,6 +40,7 @@
 	libLLVMipo \
 	libLLVMBitWriter \
 	libLLVMBitWriter_2_9 \
+	libLLVMBitWriter_2_9_func \
 	libLLVMBitReader \
 	libLLVMARMCodeGen \
 	libLLVMARMAsmPrinter \