[llvm] r324511 - Revert "[DebugInfo] Improvements to representation of enumeration types (PR36168)"

[Momchil Velikov via llvm-commits]

Thanks all,

I've just now found time to look at lldb test failures. Both failing tests (TestTemplateArgs.TemplateArgsTestCase and TestCPP11EnumTypes.CPP11EnumTypesTestCase) fail with the LLVM part only applied, because the DWARF debug info
does not contain the `DW_AT_enum_class` flag.  This is expected,  that flag is output in the debug info only when
the metadata for the enumeration type contains  DIFlagFixedEnum in flags and this flags is set bt the Clang part of the patch.

I'll now recommit both patches.

Best regards,
Momchil Velikov
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