[llvm-nm] Simplify. NFC

Change a \t to spaces
Change some zero-filling memcpy to aggregate initialization
Delete redundant ArchiveName.clear() after declaration

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@345367 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed