C API: Add LLVMGetBufferSize()

llvm-svn: 179647
diff --git a/llvm/include/llvm-c/Core.h b/llvm/include/llvm-c/Core.h
index f155b0d..093c89a 100644
--- a/llvm/include/llvm-c/Core.h
+++ b/llvm/include/llvm-c/Core.h
@@ -2580,6 +2580,7 @@
                                                               size_t InputDataLength,
                                                               const char *BufferName);
 const char* LLVMGetBufferStart(LLVMMemoryBufferRef MemBuf);
+size_t LLVMGetBufferSize(LLVMMemoryBufferRef MemBuf);
 void LLVMDisposeMemoryBuffer(LLVMMemoryBufferRef MemBuf);
 
 /**