Remove known type optimization for now
Remove known type optimization for now

Why this is causing issues needs further investigation, but this was
causing the issue found in #2407. For some reason it would see a nil
value in a path optimized for an Array value.

This would crash when derefencing the tuple value in an array:

mov    0x18(%rax),%rax

Fixes #2407

mlarraz/rubinius,jsyeo/rubinius,jemc/rubinius,kachick/rubinius,Wirachmat/rubinius,kachick/rubinius,benlovell/rubinius,digitalextremist/rubinius,sferik/rubinius,Azizou/rubinius,sferik/rubinius,benlovell/rubinius,ruipserra/rubinius,ngpestelos/rubinius,sferik/rubinius,dblock/rubinius,jemc/rubinius,mlarraz/rubinius,jemc/rubinius,pH14/rubinius,benlovell/rubinius,digitalextremist/rubinius,ngpestelos/rubinius,jsyeo/rubinius,benlovell/rubinius,digitalextremist/rubinius,ngpestelos/rubinius,digitalextremist/rubinius,dblock/rubinius,ruipserra/rubinius,digitalextremist/rubinius,ruipserra/rubinius,Wirachmat/rubinius,mlarraz/rubinius,kachick/rubinius,Wirachmat/rubinius,Wirachmat/rubinius,Wirachmat/rubinius,dblock/rubinius,pH14/rubinius,ruipserra/rubinius,heftig/rubinius,kachick/rubinius,Azizou/rubinius,ngpestelos/rubinius,dblock/rubinius,kachick/rubinius,jemc/rubinius,ngpestelos/rubinius,heftig/rubinius,ruipserra/rubinius,ruipserra/rubinius,heftig/rubinius,benlovell/rubinius,pH14/rubinius,digitalextremist/rubinius,kachick/rubinius,dblock/rubinius,jsyeo/rubinius,dblock/rubinius,jsyeo/rubinius,heftig/rubinius,pH14/rubinius,Azizou/rubinius,kachick/rubinius,Azizou/rubinius,jemc/rubinius,pH14/rubinius,mlarraz/rubinius,jsyeo/rubinius,Wirachmat/rubinius,Wirachmat/rubinius,dblock/rubinius,jsyeo/rubinius,ruipserra/rubinius,sferik/rubinius,benlovell/rubinius,digitalextremist/rubinius,ngpestelos/rubinius,Azizou/rubinius,sferik/rubinius,Azizou/rubinius,mlarraz/rubinius,pH14/rubinius,sferik/rubinius,mlarraz/rubinius,jsyeo/rubinius,jemc/rubinius,kachick/rubinius,pH14/rubinius,jemc/rubinius,sferik/rubinius,heftig/rubinius,heftig/rubinius,mlarraz/rubinius,benlovell/rubinius,heftig/rubinius,ngpestelos/rubinius,Azizou/rubinius