[llvm] [ThinLTO] Don't mark calloc function dead (PR #72673)

[Teresa Johnson via llvm-commits]

teresajohnson wrote:

> It isn't lld that is doing the handling that preserves these symbols, it is LTO, specifically llvm/lib/Object/IRSymtab.cpp. See the use of RuntimeLibcalls.def here and where it is used to preserve symbols later in the file.

(invoked from LTO.cpp via readIRSymtab, and the flags are later checked when adding symbols in addModuleToGlobalRes)


https://github.com/llvm/llvm-project/pull/72673