Do not register and de-register PassRegistrationListeners during
construction and destruction.

PassRegistrationListener is intended for use as a generic listener.
In some cases, PassRegistrationListener-derived classes were being
created, and automatically registered and de-registered in static
constructors and destructors.  Since ManagedStatics are destroyed
prior to program shutdown, this leads to errors where an attempt is
made to access a ManagedStatic that has already been destroyed.

Reviewed by: rnk, dblaikie

Differential Revision: http://reviews.llvm.org/D4106

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210724 91177308-0d34-0410-b5e6-96231b3b80d8
Try to fix the mingw build.

* MingW needs mapWindowsError.
* MingW is missing some entries in std::errc, but we don't use them.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210725 91177308-0d34-0410-b5e6-96231b3b80d8