https://bugs.llvm.org/show_bug.cgi?id=40419

            Bug ID: 40419
           Summary: clang-cl asserts on inline assembly with .def
                    directive in thinlto builds
           Product: clang
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangb...@nondot.org
          Reporter: l...@inglorion.net
                CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
                    richard-l...@metafoo.co.uk

Initially reported by Chromium at https://crbug.com/v8/8502

The problem here is that ModuleSymbolTable uses RecordStreamer to scan the
inline assembly for the information that it needs, and RecordStreamer uses the
default implementation for COFF directives (inherited from MCStreamer), which
executes llvm_unreachable.

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