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e16c0a9a68
This patch: - adds an ld64.lld.darwinnew symlink for lld, to go with f2710d4b576, so that `clang -fuse-ld=lld.darwinnew` can be used to test new Mach-O lld while it's in bring-up. (The expectation is that we'll remove this again once new Mach-O lld is the defauld and only Mach-O lld.) - lets the clang driver know if the linker is lld (currently only triggered if `-fuse-ld=lld` or `-fuse-ld=lld.darwinnew` is passed). Currently only used for the next point, but could be used to implement other features that need close coordination between compiler and linker, e.g. having a diag for calling `clang++` instead of `clang` when link errors are caused by a missing C++ stdlib. - lets the clang driver pass `-demangle` to Mach-O lld (both old and new), in addition to ld64 - implements -demangle for new Mach-O lld - changes demangleItanium() to accept _Z, __Z, ___Z, ____Z prefixes (and updates one test added in D68014). Mach-O has an extra underscore for symbols, and the three (or, on Mach-O, four) underscores are used for block names. Differential Revision: https://reviews.llvm.org/D91884