[llvm-bugs] [Bug 27847] New: Assertion `CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!"

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=27847

            Bug ID: 27847
           Summary: Assertion `CastInst::castIsValid(opc, C, Ty) &&
                    "Invalid constantexpr cast!"
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: hans at chromium.org
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 16402
  --> https://llvm.org/bugs/attachment.cgi?id=16402&action=edit
preprocessed source for reproduction

This assert started firing recently.

Repro invocation:
$ clang -cc1 -triple i686-pc-windows-msvc19.0.0 -emit-obj -target-cpu pentium4 
-Os -fms-extensions -fms-compatibility -fms-compatibility-version=19.0
-fdelayed-template-parsing -x c /tmp/a.ii

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