Compiler crash workaround
Compiler crash workaround

The compiler was dying during its type inference pass.  I believe
this is related to losing type information during the verifier's
instruction rewriting, but will investiate further to make sure.
Workaround is to just disable register promotion when this situation
is detected.

Change-Id: I1c963d67f7d61a1c1666d4ef8d593d8685ac60e0

treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst