[profcheck] Propagate profile metadata to Wrapper function in optimize mode of ExpandVariadic. (#168161)

This PR fixes the issue where profile metadata (`!prof`) is dropped from
the `VariadicWrapper` when `ExpandVariadics` runs in
`--expand-variadics-override=optimize` mode.

In optimize mode, the pass splits the original variadic function into
two parts:

- A **VariadicWrapper** (retaining the original name) that handles the
`va_list` setup.
- A **FixedArityReplacement** (new function) that contains the original
core logic.

During this process, the basic blocks and associated metadata are
spliced into the `FixedArityReplacement`. Consequently, the
`VariadicWrapper`—which serves as the entry point for callers—is left
without function entry count metadata.

This change explicitly copies the `MD_prof` metadata from the
`FixedArityReplacement` back to the `VariadicWrapper` after the split is
defined.

Co-authored-by: Jin Huang <jingold@google.com>

0 files changed, 0 insertions, 0 deletions