Rahman Lavaee ba6c5f8e4e Insert symbols for prefetch targets read from basic blocks section profile. (#168439) ...

This is the first PR to enable the prefetch optimization via Propeller
based on our
[RFC](https://discourse.llvm.org/t/rfc-code-prefetch-insertion/88668/22).
It enables emitting special symbols prefixed with
`__llvm_prefetch_target` to point to the prefetch targets as specified
via directives in the profile. A prefetch target is uniquely identified
by its function name, basic block ID, and the subblock index (used when
the target is after a call instruction).

A new pass is added which sets a field in basic blocks which have
prefetch targets. The next PR will add the prefetch insertion logic into
the same pass.

2026-01-05 15:36:59 -08:00

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