Update aosp/master LLVM for rebase to r222494.

Change-Id: Ic787f5e0124df789bd26f3f24680f45e678eef2d
diff --git a/include/llvm-c/BitWriter.h b/include/llvm-c/BitWriter.h
index f605e24..f25ad3a 100644
--- a/include/llvm-c/BitWriter.h
+++ b/include/llvm-c/BitWriter.h
@@ -16,8 +16,8 @@
 |*                                                                            *|
 \*===----------------------------------------------------------------------===*/
 
-#ifndef LLVM_C_BITCODEWRITER_H
-#define LLVM_C_BITCODEWRITER_H
+#ifndef LLVM_C_BITWRITER_H
+#define LLVM_C_BITWRITER_H
 
 #include "llvm-c/Core.h"
 
@@ -45,6 +45,9 @@
     descriptor. Returns 0 on success. Closes the Handle. */
 int LLVMWriteBitcodeToFileHandle(LLVMModuleRef M, int Handle);
 
+/** Writes a module to a new memory buffer and returns it. */
+LLVMMemoryBufferRef LLVMWriteBitcodeToMemoryBuffer(LLVMModuleRef M);
+
 /**
  * @}
  */