[llvm-bugs] [Bug 51232] New: Assertion `!FoundVal && "Key already in new map?"' failed after D6594

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=51232

            Bug ID: 51232
           Summary: Assertion `!FoundVal && "Key already in new map?"'
                    failed after D6594
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Core LLVM classes
          Assignee: unassignedbugs at nondot.org
          Reporter: martin at martin.st
                CC: llvm-bugs at lists.llvm.org, rnk at google.com,
                    timshen91 at gmail.com, w3cing at gmail.com

Created attachment 25076
  --> https://bugs.llvm.org/attachment.cgi?id=25076&action=edit
Reproduction code

After https://reviews.llvm.org/D6594, applied in
https://github.com/llvm/llvm-project/commit/a0757d8ebdefa1c54896d70d2a04f68fc23f7916,
compiling some source files for aarch64-windows-msvc fails with a failed assert
"!FoundVal && "Key already in new map?"

This can be reproduced with the attached source file like this:

$ clang -target aarch64-windows-msvc -w -c -O2 wine-preproc.c

clang: ../include/llvm/ADT/DenseMap.h:408: void llvm::DenseMapBase<DerivedT,
KeyT, ValueT, KeyInfoT, BucketT>::moveFromOldBuckets(BucketT*, BucketT*) [with
DerivedT = llvm::DenseMap<llvm::ConstantExpr*, llvm::detail::DenseSetEmpty,
llvm::ConstantUniqueMap<llvm::ConstantExpr>::MapInfo,
llvm::detail::DenseSetPair<llvm::ConstantExpr*> >; KeyT = llvm::ConstantExpr*;
ValueT = llvm::detail::DenseSetEmpty; KeyInfoT =
llvm::ConstantUniqueMap<llvm::ConstantExpr>::MapInfo; BucketT =
llvm::detail::DenseSetPair<llvm::ConstantExpr*>]: Assertion `!FoundVal && "Key
already in new map?"' failed.

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