[polly][NewPM][test] Fix polly tests under -enable-new-pm

In preparation for turning on opt's -enable-new-pm by default, this pins
uses of passes via the legacy "opt -passname" with pass names beginning
with "polly-" and "polyhedral-info" to the legacy PM. Many of these
tests use -analyze, which isn't supported in the new PM.

(This doesn't affect uses of "opt -passes=passname").

rL240766 accidentally removed `-polly-prepare` in
phi_not_grouped_at_top.ll, and it also doesn't use the output of
-analyze.

Reviewed By: Meinersbur

Differential Revision: https://reviews.llvm.org/D94266