Allow test categories to be skipped.

This adds a new parameter, --skip-category, that can be used to list
categories that should be skipped. For example, to run all tests except for
Objective-C ones, one can now write:

  ./dotest.py --skip-category objc [...]

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@187590 91177308-0d34-0410-b5e6-96231b3b80d8
Fix Linux Host::GetCurrentThreadID() to return real tid (not pthread_t).
This fixes threadname logging (--thread-name)
Add "-t" to TestLogging.py script to enable threadsafe and disable threadname logging



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@187599 91177308-0d34-0410-b5e6-96231b3b80d8
Updates TestLongjump to ensure that compiler optimizations don't affect the
mapping of source to assembly so that the same test script can be used
with more compilers.

Patch by Andy Kaylor!

Also marks the LLDB test of template parameters as xfail on icc.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@187600 91177308-0d34-0410-b5e6-96231b3b80d8