[JITLink] Fix a missing header and bad prototype.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@358819 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/ExecutionEngine/JITLink/JITLink_EHFrameSupport.cpp b/lib/ExecutionEngine/JITLink/JITLink_EHFrameSupport.cpp
index bf05147..8d94e46 100644
--- a/lib/ExecutionEngine/JITLink/JITLink_EHFrameSupport.cpp
+++ b/lib/ExecutionEngine/JITLink/JITLink_EHFrameSupport.cpp
@@ -10,6 +10,7 @@
 #include "JITLink_EHFrameSupportImpl.h"
 
 #include "llvm/BinaryFormat/Dwarf.h"
+#include "llvm/Support/DynamicLibrary.h"
 
 #define DEBUG_TYPE "jitlink"
 
@@ -428,7 +429,7 @@
                                   "__register_frame function not found");
 }
 
-static void deregisterFrameWrapper(const void *P) {
+static Error deregisterFrameWrapper(const void *P) {
   static void((*DeregisterFrame)(const void *)) = 0;
 
   if (!DeregisterFrame)