[lldb] Emit specification and spare_bits_mask in debug info, consume them in lldb #8243
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The spare bits mask is a mask of the unused bits that a type may have. Swift uses these on enums to pack extra data when wrapping these enums in other types. Emit this field in LLVM-IR and DWARF.
Add a specification_of attribute to LLVM DebugInfo, which is analogous to DWARF's DW_AT_specification. According to the DWARF spec: "A debugging information entry that represents a declaration that completes another (earlier) non-defining declaration may have a DW_AT_specification attribute whose value is a reference to the debugging information entry representing the non-defining declaration." This patch allows types to be specifications of other types. For example, a templated type where the template parameters are substituted in could be a specification of the non-substituted template type.
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