Make emission of extension block symbols a formal feature #61637
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This PR is a follow up to #59047 and #61406.
This PR adds the
-omit-extension-block-symbols
flag for explicitly disabling the emission ofswift.extension
symbols in symbol graph files. Furthermore, it adds the emission of extension block symbols to the feature listlib/Option/features.json
as requested by @d-ronnqvist .The
-omit-extension-block-symbols
has no effect yet (except for overriding preceding-emit-extension-block-symbols
flags), as this PR does not change the default behavior.This PR finally fixes swiftlang/swift-docc#210.
#61406 and swiftlang/swift-driver#1205 should before/with this PR.