Fix memory leak in ASTContext where ASTRecordLayout objects involving C++ structures wouldn't have their associated memory destroyed when using a BumpPtrAllocator.  These objects internally use a DenseMap.
Fix memory leak in ASTContext where ASTRecordLayout objects involving C++ structures wouldn't have
their associated memory destroyed when using a BumpPtrAllocator.  These objects internally use
a DenseMap.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@105659 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang