- Switch to llvm7 for Tumbleweed as llvm8 is not able to build
bootstrap version 0.17.6
See https://github.com/ldc-developers/ldc/issues/3109
- Disable -flto=4 option as llvm does not recognize this option

- Update to 1.16.0:
* Big news
- Frontend, druntime and Phobos are at version 2.086.1, incl.
a DIP1008 fix. (#3062, #3076, #3091) (new)
- Non-Windows x86: Faster real versions of std.math.{tan,expi}. (#2855)
- dcompute: New __traits(getTargetInfo, "dcomputeTargets"). (#3090) (new)
* Platform support
- Supports LLVM 3.9 - 8.0 (incl. 7.1).
* Bug fixes
- Make pragma(LDC_no_typeinfo) actually elide TypeInfo emission
for structs, classes and interfaces. (#3068)
- Windows: Fix DLL entry point in MinGW-based libs.
(ldc-developers/mingw-w64-libs@8d930c1)
- WebAssembly: Use --export-dynamic when linking with LLD 8+.
(#3023, #3072)
- Fix corrupt this in functions nested in in/out contracts.
(45460a1)
- Fix identity comparisons of integral vectors. (a44c78f)
- Improved handling of unsupported vector ops. (a44c78f)
- uClibc: Fix C assert calls. (#3078, #3082) (new)
- Improved error message on global variable collision.
(#3080, #3081) (new)
* Known issues
- Buggy older ld.bfd linker versions may wrongly strip out
required symbols, e.g., ModuleInfos (so that e.g. no module