fix Issue 13113 - cannot build druntime's gc.d with -debug=INVARIANT, bad @nogc inference?

Bypass attribute check on direct invariant calls.
fix Issue 9449 - Static arrays of 128bit types segfault on initialization. Incorrect calling of memset128ii
Move sqrt into Port
Remove two unreferenced array types
Merge pull request #3788 from yebblies/arraytypes

[cleanup] Remove two unreferenced array types
Merge pull request #3787 from yebblies/sqrtport

[DDMD] Move sqrt into Port
Merge pull request #3775 from 9rnsr/fix13113

Issue 13113 - cannot build druntime's gc.d with -debug=INVARIANT, bad @nogc inference?
add volatile load/store to core.bitop
Merge pull request #3773 from WalterBright/peek-poke

fix Issue 13138 add peek/poke to core.bitop
Merge pull request #3784 from WalterBright/fix9449

[critical] fix Issue 9449 - Static arrays of 128bit types segfault on initializatio...
fix Issue 13152 - Compiler high cpu usage and never ends

Partially revert "Merge pull request #2448 from hpohl/10752"
Merge pull request #3790 from 9rnsr/fix13152

[REG2.064] Issue 13152 - Compiler high cpu usage and never ends
fix Issue 13158 - "void has no value" in std.variant.Algebraic (affects D:YAML)
Merge pull request #3793 from 9rnsr/fix13158

[REG2.066a] Issue 13158 - "void has no value" in std.variant.Algebraic (affects D:YAML)
fix Issue 12057 - [ICE], backend/cg87.c 925
Merge pull request #3794 from WalterBright/fix12057

fix Issue 12057 - [ICE], backend/cg87.c 925
Add manually ported frontend source files to version control
Add settings file and makefile targets to build ddmd
Add generated source to .gitignore
Add magicport source to repo