DebugInfo: use llvm::DINode::DIFlags type for debug info flags

Use llvm::DINode::DIFlags type (strongly typed enum) for debug flags instead of unsigned int to avoid problems on platforms with sizeof(int) < 4: we already have flags with values > (1 << 16).

Patch by: Victor Leschuk <vleschuk@gmail.com>

Differential Revision: https://reviews.llvm.org/D23767



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@280701 91177308-0d34-0410-b5e6-96231b3b80d8