Leftovers from cmm-options fix

[phadej]

#6033
cc @angerman

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Things that work now (i.e. that I (@hvr) tested manually; these should be turned into testsuite tests long-term):

• cmm-sources and asm-sources are compiled (in a separate phase like c-sources are) and the resulting object files are linked into the respective component (i.e. like c-sources)
• cabal sdist properly includes cmm-sources and asm-sources in the src-dist
• cmm-options are passed (directly) to GHC when compiling cmm-sources
• asm-options are passed (via -opta) to GHC when compiling asm-sources files
• ghc-options are NOT passed to compilation of cmm-sources/asm-sources

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@23Skidoo:

If I have both preprocessor-generated asm-sources and cmm-sources, won't this add the union of these to the LBI's asmSources?

Actually, this probably will break if I have any preprocessor-generated C files at all.

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TODO: forward port b7cd00b to 3.0+

[23Skidoo]

I left some comments in #6033, were they addressed in the version that got merged to master?

[phadej]

Edited the description to include preprocessor-generated issue