use naked asm blocks to clear registers
fix Issue 12800 - Fibers are broken on Win64

- save non-volatile registers RSI and RDI
Merge pull request #1012 from MartinNowak/fix12800

fix Issue 12800 - Fibers are broken on Win64
do not try to detach a thread that isn't running yet
Merge pull request #1016 from rainers/unittest_thread_detach

Fix unittest in core.thread
core.exception: Linkify exception types

Since the actual descriptions for the various exceptions lie in the
exceptions' documentation, they should be more discoverable. The functions
themselves may pop up in stack traces.
Merge pull request #1018 from CyberShadow/pull-20141112-215524

core.exception: Linkify exception types
fix Issue 13725 - onInvalidMemoryOperationError et al should not be inlined
Merge pull request #1019 from CyberShadow/pull-20141113-005155

fix Issue 13725 - onInvalidMemoryOperationError et al should not be inlined
precise GC as presented at DConf 2013