DebugInfo: Reduce the scope of some variables related to debug_ranges emission
DebugInfo: Reduce the scope of some variables related to debug_ranges emission

Minor tidy up/NFC

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@374613 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm