Remove unused code

- ReadLocker constructors that take a lock
- Unconditional Lock::ReadLock and ReadLocker::Lock
  (all consumers use TryLock)
- Make Unlock protected, as it has no external consumers


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@187147 91177308-0d34-0410-b5e6-96231b3b80d8
Correct typo in comments



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@187148 91177308-0d34-0410-b5e6-96231b3b80d8
Set thread names on FreeBSD

Also move the logic to shorten thread names from linux/Host.cpp to a new
SetShortThreadName as both FreeBSD and Linux need the functionality.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@187149 91177308-0d34-0410-b5e6-96231b3b80d8
Fix the lldb build after the removal of mblaze.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@187151 91177308-0d34-0410-b5e6-96231b3b80d8