[lldb][DWARFASTParserClang][NFCI] Simplify ParseChildParameters (#123790) This patch refactors `ParseChildParameters` in a way which makes it (in my opinion) more readable, removing some redundant local variables in the process and reduces the scope of some variables. **Motivation** Since `DW_AT_object_pointer`s are now attached to declarations, we can test for their existence to check whether a C++ method is static or not (whereas currently we're deducing this from `ParseChildParameters` based on some heuristics we know are true for most compilers). So my plan is to move the code for determining `type_quals` and `is_static` out of `ParseChildParameters`. The refactoring in this PR will make this follow-up patch hopefully easier to review. **Testing** * This should be NFC. The main change is that we now no longer iterate over `GetAttributes()` but instead retrieve the name, type and is_artificial attributes of the parameters individually.
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