Fix incorrect incorrect cast identification in clang-format.

This fixes llvm.org/PR16534.

Before:
aaaaa& operator+(const aaaaa&)LLVM_DELETED_FUNCTION;
After:
aaaaa& operator+(const aaaaa&) LLVM_DELETED_FUNCTION;

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185828 91177308-0d34-0410-b5e6-96231b3b80d8