[llvm-bugs] [Bug 30978] New: [codeview] Emit file checksums

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https://llvm.org/bugs/show_bug.cgi?id=30978

            Bug ID: 30978
           Summary: [codeview] Emit file checksums
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rnk at google.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Currently we emit all zeros in the CV file checksum table. The debugger uses
this information to inform the user if the source file has changed since the
program was built.

We should extend DIFile with a checksum field and have the frontend emit that
when emitting CodeView.

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