LDC 1.15.0

[kinke]

Glad to announce LDC 1.15:

* Based on D 2.085.1.
* Support for LLVM 8.0. The prebuilt packages ship with LLVM 
8.0.0 and include the Khronos SPIRV-LLVM-Translator, so that 
dcompute can now emit OpenCL too.
* New -lowmem switch to enable the GC for the front-end, trading 
compile times for less required memory (in some cases, by more 
than 60%).
* New generic @llvmAttr("name") parameter UDAs, incl. @restrict 
with C-like semantics.
* Dropped support for 32-bit macOS. Min macOS version for 
prebuilt package raised to 10.9.
* Prebuilt packages don't depend on libtinfo/libedit and don't 
require SSSE3 anymore.
* Fix: functions annotated with `pragma(inline, true)` are 
implicitly cross-module-inlined again.

Full release log and downloads: 
https://github.com/ldc-developers/ldc/releases/tag/v1.15.0

Thanks to all contributors!