Implement get_magic with generic tools and inline it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210716 91177308-0d34-0410-b5e6-96231b3b80d8
Don't acquire the mutex during the destructor of PassRegistry.

This destructor is run as part of static program termination, and
so all ManagedStatics (including this lock) will have been
destroyed by llvm_shutdown.  Furthermore, if there is actually
a race condition during static program termination, then we are
just hiding a bug somewhere else, because other threads should
not be running at this point.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210717 91177308-0d34-0410-b5e6-96231b3b80d8
[FastIsel][X86] Add support for lowering the first 8 floating-point arguments.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210719 91177308-0d34-0410-b5e6-96231b3b80d8
[FastISel][X86] Add support for the sqrt intrinsic.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210720 91177308-0d34-0410-b5e6-96231b3b80d8
Teach LoopUnrollPass to respect loop unrolling hints in metadata.

See http://reviews.llvm.org/D4090 for more details.

The Clang change that produces this metadata was committed in r210667

Patch by Mark Heffernan.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210721 91177308-0d34-0410-b5e6-96231b3b80d8