Rebase stable6 (#16967)

* Document template instance duplication status as part of its field documentation. (#16643)

* Fix Bugzilla 24599 - Wrongly elided TypeInfo emission (#15868)

Reverting #14844, which caused such missing TypeInfos, *and* making
sure the special TypeInfo members are fully analyzed and ready for
codegen (otherwise hitting an assertion for the real-world project).

* Reorganize backend build files to match target and make more similar per line (#16672)

* Remove redundant suggestions on linker errors (#16711)

* Fix bugzilla 24337 - Segfault when printing an int[] cast from a string (#16729)

* Add BitFieldStyle.Gcc_Clang_ARM

Required for 32-bit ARM, and non-Apple 64-bit ARM targets.

The only difference to `Gcc_Clang` is that anonymous and 0-length
bit-fields do contribute to the aggregate alignment.

Caught by existing proper C interop tests in
runnable_cxx/testbitfields.d on such targets. The hardcoded bad tests
in runnable/{bitfieldsposix64.c,dbitfieldsposix64.d} however now fail
after the fix, on such targets again.

* [refactor to `TargetC.contributesToAggregateAlignment(BitFieldDeclaration)` hook]

* Fix Bugzilla Issue 24687 - [REG2.110] Cannot cast string-imports to select overload anymore

* Also make deprecationSupplemental adhere to error limit (#16779)

Co-authored-by: Dennis Korpel <dennis@sarc.nl>

* Fix bugzilla 24699 - [REG2.108] No short-circuit evaluation of mixing template bool argument

* Fix bugzilla 24731 - IFTI cannot handle integer expressions (#16822)

* Fix Bugzilla Issue 24760 - ICE on variadic after default argument

* Fix bugzilla 24790 - -vcg-ast ICE on lowered assign exp (#16914)

Co-authored-by: Dennis Korpel <dennis@sarc.nl>

* Fix bugzilla 24764 - ICE when -vcg-ast prints imported invariant (#16917)

Co-authored-by: Dennis Korpel <dennis@sarc.nl>

* Fix bugzilla 24431 - dmd -vcg-ast crashes printing failed template in… (#16916)

---------

Co-authored-by: Richard (Rikki) Andrew Cattermole <richard@cattermole.co.nz>
Co-authored-by: Martin Kinkelin <kinke@users.noreply.github.com>
Co-authored-by: Dennis <dkorpel@users.noreply.github.com>
Co-authored-by: Martin Kinkelin <mkinkelin@symmetryinvestments.com>
Co-authored-by: Martin Kinkelin <noone@nowhere.com>
Co-authored-by: RazvanN7 <razvan.nitu1305@gmail.com>
Co-authored-by: Dennis Korpel <dennis@sarc.nl>
Co-authored-by: Dennis Korpel <dkorpel@gmail.com>

compiler/test/compilable/staticforeach.d

@@ -117,8 +117,8 @@ foo2
 T2
 TestStaticForeach2
 issue22007
-1 2 '3'
-2 3 '4'
+1 2 3
+2 3 4
 0 1
 1 2
 2 3