Add libclang API hook "clang_getIBOutletCollectionType" to query the collection type for iboutletcollection attributes.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@112139 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/libclang.darwin.exports b/tools/libclang/libclang.darwin.exports
index f2087b7..6a36966 100644
--- a/tools/libclang/libclang.darwin.exports
+++ b/tools/libclang/libclang.darwin.exports
@@ -30,6 +30,7 @@
 _clang_equalTypes
 _clang_formatDiagnostic
 _clang_getCString
+_clang_getIBOutletCollectionType
 _clang_getCanonicalType
 _clang_getClangVersion
 _clang_getCompletionAvailability