Merge remote-tracking branch 'upstream/stable' into merge_stable

[MartinNowak]

No description provided.

[dlang-bot]

Thanks for your pull request, @MartinNowak!

Bugzilla references

Auto-close	Bugzilla	Severity	Description
✓	15875	normal	case of undetected circular reference in function parameter
✓	17259	critical	ICE with multiple mixin templates containing conflicting ctor declarations
✓	17285	normal	Segfault when types are used in array literals
✓	17290	normal	DMD crash due to circular reference in function return type
✓	19655	regression	DMD generates wrong code for some circular dependencies
✓	19656	regression	D compiler fails to resolve circular module dependency when modules are compiled separately
✓	19657	regression	D compiler fails to resolve circular module dependency when modules are compiled together
✓	19691	regression	ICE on null default value for struct parameter in constructor
✓	19717	normal	case of segfault due to undetected forward reference
✓	19724	regression	Regression: wrong order of linker arguments, again: -L-l before -L--start-group
✓	19730	regression	if (auto x) {} isn't properly rejected
✓	19746	regression	DMD fails to compile some circular dependencies spiced with is (T == super) condition
✓	19750	regression	[Reg v2.070.2] DMD fails with some circular module refs with Template/Mixin instances
✓	19755	normal	Compiler crash

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub fetch digger
dub run digger -- build "master + dmd#9489"