Fix Windows warnings.

This fixes a number of trivial warnings in the Windows build. This is part of a larger effort to make the Windows build warning-free.

See http://reviews.llvm.org/D3914 for more details.

Change by Zachary Turner



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@209749 91177308-0d34-0410-b5e6-96231b3b80d8