This patch fixes a profile metadata missing in the `ExpandMemCmp` pass
when it expanding `memcmp` calls. This would cause branches between
different blocks to lose their profile data, potentially leading to
suboptimal code generation.
The patch updates the `ExpandMemCmp` pass to set branch weights to a
default `unknown`(50/50 weights) value when a profile is available. This
prevents the expansion from making a previously profiled branch
unprofiled.
The patch also includes updates to the tests to reflect the new branch
weights.
Co-authored-by: Jin Huang <jingold@google.com>
02ca50e560