Bug ID: 36219
           Summary: [ThinLTO] link asserts 'BA && "Refcount and block
                    address map disagree!"'
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86

Created attachment 19801
repro test case

Found this experimenting with ThinLTO and CFI.
Reduced IR is attached. To reproduce:
# opt a.s -thinlto-bc -o a.o
# ld.lld a.o  -r
Assertion failed: (BA && "Refcount and block address map disagree!"), function
lookup, file /Users/dmikulin/Dev/llvm-project/llvm/lib/IR/Constants.cpp, line
. . .

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