15c8085202
This patch relands https://github.com/llvm/llvm-project/pull/71004 which was reverted because the clang change it depends on was reverted. In addition to the original patch, this PR includes a change to `SymbolFileDWARF::ParseVariableDIE` to support CU-level variable definitions that don't have locations, but represent a constant value. Previously, when debug-maps were available, we would assume that a variable with "static lifetime" (which in this case means "has a linkage name") has a valid address, which isn't the case for non-locationed constants. We could omit this additional change if we stopped attaching linkage names to global non-locationed constants. Original commit message: """ https://github.com/llvm/llvm-project/pull/71780 proposes moving the `DW_AT_const_value` on inline static members from the declaration DIE to the definition DIE. This patch makes sure the LLDB's expression evaluator can continue to support static initialisers even if the declaration doesn't have a `DW_AT_const_value` anymore. Previously the expression evaluator would find the constant for a VarDecl from its declaration `DW_TAG_member` DIE. In cases where the initialiser was specified out-of-class, LLDB could find it during symbol resolution. However, neither of those will work for constants, since we don't have a constant attribute on the declaration anymore and we don't have constants in the symbol table. """ Depends on: * https://github.com/llvm/llvm-project/pull/71780
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