[compiler-rt] [llvm] [TypeProf][InstrFDO]Omit vtable symbols in indexed profiles by default (PR #96520)

[Mingming Liu via llvm-commits]

minglotus-6 wrote:

> To clarify, are we currently including both compressed and uncompressed vtable names in the indexed profiles?

I forgot to mention that `LLVM_ENABLE_ZLIB` is by default enabled if zlib is found (https://llvm.org/docs/CMake.html). Our internal toolchains turns this option on and generated compressed names. 

I have seen `DLLVM_ENABLE_ZLIB=0` on some buildbots. IR tests need to `requires: zlib` to be [unsupported](https://llvm.org/docs/CommandGuide/lit.html#test-status-results) on those buildbots.

https://github.com/llvm/llvm-project/pull/96520