Leonard Grey c23135c548 -fsanitize=function: fix .subsections_via_symbols (#87527) ...

-fsanitize=function emits a signature and function hash before a
function. Similar to 7f6e2c9, these can be sheared off when
`.subsections_via_symbols` is used.

This change uses the same technique 7f6e2c9 introduced for prefixes:
emitting a symbol for the metadata, then marking the actual function
entry as an .alt_entry symbol.

2024-04-08 16:05:52 -04:00

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