[llvm-branch-commits] [BOLT] Support more than two jump table parents (PR #99988)

[Amir Ayupov via llvm-branch-commits]

https://github.com/aaupov created https://github.com/llvm/llvm-project/pull/99988

Multi-way splitting can cause multiple fragments to access the same jump
table. Relax the assumption that a jump table can only have up to two
parents.

Test Plan: added bolt/test/X86/three-way-split-jt.s