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)