3df88ec335
On Windows certain function from `Signals.h` require that `DbgHelp.dll` is loaded. This typically happens when the main program calls `llvm::InitLLVM`, however in some cases main program doesn't do that (e.g. when the application is using LLDB via `liblldb.dll`). This patch adds a safe guard to prevent crashes. More discussion in https://reviews.llvm.org/D119009. Reviewed By: aganea Differential Revision: https://reviews.llvm.org/D119181