[NPM] Bail out when -foo and --passes=foo are both specified

[NPM] Bail out when -foo and --passes=foo are both specified

Summary:
Currently when --passes is used, any passes specified via -foo are
ignored. Explicitly bail out when that happens.

This requires changing some tests. Most were straightforward, but
codegenprepare-produced-address-math.ll is tricky. One of its RUNs runs
CodeGenPrepare. I tried porting CodeGenPrepare to the NPM, but ended up
getting stuck when I needed a TargetMachine. NPM doesn't have support
for MachineFunctions yet. So I just deleted that RUN line, since it was
mass-added in https://reviews.llvm.org/D54848 and is likely not that
useful.

Reviewers: echristo, hans

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D82271