[BOLT] Set EntryDiscriminator in YAML profile for indirect calls

Indirect call handling missed setting an `EntryDiscriminator` while it's
set for direct calls and tail calls.

Improve YAML profile accuracy by unifying the destination setting
between direct and indirect calls into `setCSIDestination` method.

Depends on: https://github.com/llvm/llvm-project/pull/86848

Test Plan: Updated bolt/test/X86/yaml-secondary-entry-discriminator.s

Reviewers: ayermolo, maksfb, rafaelauler

Reviewed By: maksfb

Pull Request: https://github.com/llvm/llvm-project/pull/82128