Disable new debug record format (#2554)

After LLVM commit 91446e2 ("Repply#2 "[RemoveDIs] Load into new
debug info format by default in LLVM (#89799)"", 2024-05-03), we need
to disable the new debug record format explicitly until we have
migrated to the new format.

Original commit:
KhronosGroup/SPIRV-LLVM-Translator@8878e7bfddbe2cb

Author: svenvh

llvm-spirv/lib/SPIRV/SPIRVReader.cpp

@@ -5052,6 +5052,10 @@ llvm::convertSpirvToLLVM(LLVMContext &C, SPIRVModule &BM,
                          const SPIRV::TranslatorOpts &Opts,
                          std::string &ErrMsg) {
   std::unique_ptr<Module> M(new Module("", C));
+  // TODO: Migrate to the new debug record format.  Until then, keep using the
+  // old format.
+  M->setNewDbgInfoFormatFlag(false);
+
   SPIRVToLLVM BTL(M.get(), &BM);
 
   if (!BTL.translate()) {