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...ssion. For instance, we need this to specify the length of an SVE vector as a DWARF expression that is based on a (runtime defined) DWARF pseudo register. Some preliminary feedback was that we may want to use something similar for lowerBound as well. Also Adrian suggested (https://reviews.llvm.org/D41697#966736) that it may be useful in general to reference Metadata nodes in DIExpressions if we ever need to combine local variables with DWARF expressions. Something like that might be needed to e.g. reference a value from an offset of a pointer when using an array descriptor, although I could use som...