Fix Issue 12873 - Valgrind unhandled instruction bytes 0x48 0xDB (redundant REX_W prefix on x87 load)
Fix Issue 10054 - x86_64 valgrind reports unrecognised instruction (DMD 2.062)
Merge pull request #3634 from yebblies/issue12873

Issue 12873 - Valgrind unhandled instruction bytes 0x48 0xDB (redundant REX_W prefix on x87 load)
Merge pull request #3635 from yebblies/issue10054

Issue 10054 - x86_64 valgrind reports unrecognised instruction (DMD 2.062)
Add manually ported frontend source files to version control
Add settings file and makefile targets to build ddmd
fix posix.mak ddmd rule
Add generated source to .gitignore
Add magicport source to repo