[LLVMbugs] [Bug 22779] New: Split DI/MDLocalVariable into ArgumentVariable AutoVariable (and kill the fake DW_TAGs)

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22779

            Bug ID: 22779
           Summary: Split DI/MDLocalVariable into ArgumentVariable
                    AutoVariable (and kill the fake DW_TAGs)
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Core LLVM classes
          Assignee: unassignedbugs at nondot.org
          Reporter: dexonsmith at apple.com
                CC: llvmbugs at cs.uiuc.edu
            Blocks: 21432
    Classification: Unclassified

`MDLocalVariable` doesn't use `DW_TAG_variable`, even though that's the
appropriate DWARF tag.  Instead, it uses `DW_TAG_auto_variable` and
`DW_TAG_arg_variable` as discriminators to determine the type of local
variable.

Since bug 22464, we have a better discriminator: `Metadata::getMetadataID()` --
i.e., we should just split these into two subclasses.  This will also drop the
`tag:` field from assembly.  In the process, we can drop the `arg:` field from
non-argument variables (I don't think it was ever used, but it was possible to
set it).

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