Lit: LIT_PRESERVES_TMP should be aware of TMPDIR, too.

TMPDIR is preferred in Unix.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192891 91177308-0d34-0410-b5e6-96231b3b80d8
[DebugInfo] Delete dead code, simplify and fix code style for some existing code. No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192894 91177308-0d34-0410-b5e6-96231b3b80d8
[mips][msa] Added lsa instruction



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192895 91177308-0d34-0410-b5e6-96231b3b80d8