LLVM EasyBlock fails when used as a Bundle component

[Crivella]

Currently the EasyBlock accesses the installdir and builddir variable at the __init__ causing this values to not be properly set when used as a Bundle compoent

Thanks to @bedroge for the report and investigation
https://github.com/easybuilders/easybuild-easyblocks/blob/develop/easybuild/easyblocks/generic/bundle.py#L261

Fix will require moving all configurations pertaining to this variable to be moved in the configure_step

[bedroge]

I'm probably running into another issue now due to using this in a Bundle: while testing things with ROCm-LLVM 6.4.0, which is based on LLVM 19 (older versions were based LLVM 18), I'm suddenly getting the following error which I didn't get for older versions:

== FAILED: Installation ended unsuccessfully: GCC installation path '{check_prefix}' does not match expected path '{gcc_prefix}' (took 44 mins 2 secs)

It looks like the <compiler>.cfg files are not being created for the final installation, and I think it's because the post_processing_step is not being called for bundle components. Not sure if this can be fixed easily, also because there's some more functionality in that same function, but otherwise I can probably work around it quite easily.

[Crivella]

If i recall correctly that used to be a post_install_step that got deprecated in 5.x.
Since i believe that step is part of the installation, it might be worth trying moving the logic from post_processing_step to install_step after calling super(EB_LLVM, self).install_step()