Do not inline loops without exit edges

Fixes an issue with LinearOrder after inlining a function containing a
loop that has no exit edge.  The failure is due to incorrect loop
information being computed for blocks that are not on a path to the
inlined function's return.  They should not be considered part of the
caller's enclosing loop, but are today.

Bug: 32547653
Test: run-test --host 478-checker-inline-noreturn
Change-Id: I9694a1cb861430051c801d07f7ce29752332cba5