[BOLT] Check CallProfile annotation in buildCallGraph #134733
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For indirect jumps with unknown control flow, BOLT will not set a tail
call annotation, which results in skipping such sites in call graph
construction, even if the jump has CallProfile annotation.
Missing call graph edges in turn hurt function ordering, especially when
they are hot.
Example from mkl_blas_xsgemm:
Explicitly check the presence of a CallProfile annotation to avoid
missing call graph edge.
Test Plan: added unknown-cf-call-graph.s