Move codegen backends into anonymous namespaces in source files and don't build them if not enabled#5776

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dsharletg merged 28 commits intomasterfrom

dsharletg/hide-codegen2

Mar 4, 2021

Commits on Feb 26, 2021

Remove unused vertex buffer parameters.
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Offload GPU code in a lowering pass instead of via CodeGen_GPU_Host. Fixes #5650, fixes #2797, fixes #2084, now #1971 is more relevant.
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Commits on Feb 28, 2021

Commits on Mar 2, 2021

Merge branch 'master' of github.com:halide/Halide into dsharletg/hide-codegen2
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