LDC 1.27.0-beta2

[kinke]

Glad to announce the second beta for LDC 1.27. Some noteworthy 
changes since beta1:

* Frontend and druntime/Phobos upgraded to yesterday's DMD stable.
* Windows DLL support: some fixes/tweaks and a new -dllimport 
option for greater flexibility.
* Prebuilt Linux and Mac packages can show significant compiler 
performance increases due to newly employing the mimalloc 
allocator.
* Important fixes for -linkonce-templates, DWARF v5 (e.g. with 
linked-in C[++] parts compiled with gcc 11) and bundled dub 
supporting somewhat longer paths on Windows.

Full release log and downloads: 
https://github.com/ldc-developers/ldc/releases/tag/v1.27.0-beta2

Please help test, and thanks to all contributors & sponsors!