[BOLT] Set EntryDiscriminator in YAML profile for indirect calls

[aaupov]

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: #86848

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

[dcci]

Also address the issue with enumeration of secondary entry points:
make them start with 1 instead of 0 (reserved for primary entry point).

^ do you want to split this in a separate commit?

[aaupov]

Also address the issue with enumeration of secondary entry points:
make them start with 1 instead of 0 (reserved for primary entry point).

^ do you want to split this in a separate commit?

Makes sense. Will do.

[aaupov]

Split out into #86848 (WIP)

[maksfb]

LGTM