ARM sched model: Add SIMD/VFP load/store instructions on Swift

Reapply 183270.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183445 91177308-0d34-0410-b5e6-96231b3b80d8
Debug Info: simplify parameter ordering preservation

Seems we emit the parameter ordering number (spuriously named 'arg
number') in the debug info, so there's no need to search through the
variable list to figure out the parameter ordering. This implementation
does 'always' do the work, even in non-optimized debug info (the
previous implementation checked the existence of the 'variables' list on
the subprogram which is only present in optimized builds).

No intended functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183446 91177308-0d34-0410-b5e6-96231b3b80d8
Revert "ARM sched model: Add SIMD/VFP load/store instructions on Swift"

Breaks linux build bots (I thought the problem was something else).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183447 91177308-0d34-0410-b5e6-96231b3b80d8