[Lldb-commits] [PATCH] Use the DWARF linkage name when importing C++ methods

[Nelson Elhage via lldb-commits]

When importing C++ methods into clang AST nodes from the DWARF symbol
table, preserve the DW_AT_linkage_name and use it as the linker ("asm")
name for the symbol.

Concretely, this enables `expression` to call into names that use the GNU
`abi_tag` extension, and enables lldb to call into code using std::string
or std::list from recent versions of libstdc++. See
https://bugs.llvm.org/show_bug.cgi?id=35310 . It also seems broadly more
robust than relying on the DWARF->clang->codegen pipeline to roundtrip
properly, but I'm not immediately aware of any other cases in which it
makes a difference.

- Nelson
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