Revert "Fix build break on 64bit and Fix the length bug in MacroAssembler::CopyBytes"

This reverts commit 19b72fea644f3726ef46eaeff99fa63e9ff08c9d.
Revert "s390 native optimized version of CopyBytes"

This reverts commit 9604f65776899e234119e39f6dbf38fe2b1d5927.