Revert "fix test runner"

This reverts commit 8c42dd1f6735eddea1d7441f31bb5839441e794d.
Revert "Support named unittests"

This reverts commit 9bc336d703c4dcfbc087eeb901e447dbba2f72bb.
Revert "Use new unittest format in default runner"

This reverts commit 64aa857d3e3c771b935064ad6d6575c4c40cfe42.
Revert "Add enhanced unittest runtime information"

This reverts commit 9279278770dd3523d759585bea5283cd69be5cf7.
add core.checkedint
GC: remove redundant null checks.
Merge pull request #839 from WalterBright/checkedint

add core.checkedint
add reference
Merge pull request #846 from WalterBright/add-ref

add reference
Merge pull request #845 from Safety0ff/removeuseless

GC: remove redundant null checks.
Replace use of the deprecated Duration.fracSec with Duration.split.
Merge pull request #848 from jmdavis/semaphore

Replace use of the deprecated Duration.fracSec with Duration.split.
Add `@nogc` to `TypeInfo` and AA functions.
Merge pull request #840 from denis-sh/add-`@nogc`-to-`TypeInfo`-and-AA-functions

Add `@nogc` to `TypeInfo` and AA functions.
fix Issue 12738 - core.sys.posix.signal sigaction_t handler type mismatch
Merge pull request #849 from WalterBright/fix12738

[REG] fix Issue 12738 - core.sys.posix.signal sigaction_t handler type mismatch
Fix issue 12962 - Should use isainfo on Solaris systems to determine
model
ARM fixes for 2.065
Merge pull request #851 from jpf91/arm

ARM fixes up to 2.065
Merge pull request #850 from jasonbking/isainfo

Fix issue 12975 - Should use isainfo on Solaris systems to determine model