Implement a simple hash function for libclang cursors

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@119876 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/libclang.exports b/tools/libclang/libclang.exports
index fce89ca..de770ee 100644
--- a/tools/libclang/libclang.exports
+++ b/tools/libclang/libclang.exports
@@ -102,6 +102,7 @@
 clang_getTranslationUnitSpelling
 clang_getTypeDeclaration
 clang_getTypeKindSpelling
+clang_hashCursor
 clang_isCursorDefinition
 clang_isDeclaration
 clang_isExpression