Revert "Make the c
feature for compiler-builtins
opt-in instead of inferred" #103732
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This reverts commit 3acb505 (PR #101833).
The changes in this commit caused several bugs/incompatibilities (#101833 (comment), #102560). For now we're reverting this commit and will re-land it alongside fixes for those bugs.
Re-opens #101172
cc #102560
cc #102579