DebugLoc defines LineCol as 32 bit in comment but unsigned in code.
This patch modifies LineCol to be a uint32_t.

See http://llvm.org/bugs/show_bug.cgi?id=17957



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194957 91177308-0d34-0410-b5e6-96231b3b80d8