[llvm-dev] [RFC] Expanding the scope of ENABLE_EXPERIMENTAL_NEW_PASS_MANAGER

[Arthur Eubanks via llvm-dev]

The ENABLE_EXPERIMENTAL_NEW_PASS_MANAGER CMake flag currently only affects
Clang. It should probably also change all other uses of pass managers where
possible.

There are a couple of uses inside LLD for LTO which already have new/legacy
PM flags and should probably look at ENABLE_EXPERIMENTAL_NEW_PASS_MANAGER
to determine the default. Some
<https://github.com/llvm/llvm-project/blob/1314a4938fba865412598b7227cb4657d59cd8bc/lld/wasm/Driver.cpp#L382>
examples
<https://github.com/llvm/llvm-project/blob/1314a4938fba865412598b7227cb4657d59cd8bc/llvm/include/llvm/LTO/Config.h#L53>
.

Also at some point in the future when check-llvm has been fixed to work
with opt's -enable-new-pm flag by default, that should also be dependent
upon ENABLE_EXPERIMENTAL_NEW_PASS_MANAGER.

Any objections?
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