fix for Issue 11543 - multiple definition of std.regex with shared library

- Detect copy relocated ModuleInfos when checking for
  conflicting module definitions.
fix Issue 12800 - Fibers are broken on Win64

Win64 version of the context switch used the wrong registers for parameters
activate Win64 unittests for Fibers
Merge pull request #809 from jblume/master

fix Issue 12800 - Fibers are broken on Win64
Merge pull request #791 from MartinNowak/fix11543

fix for Issue 11543 - multiple definition of std.regex with shared library