[llvm-dev] emulated-tls + LTO

[Pirama Arumuga Nainar via llvm-dev]

The gold plugin supports many of the backend options.  But Clang doesn't
pass all of them to the plugin as it does to the backend.

For example, to support -emulated-tls with LTO, Clang needs to pass
-emulated-tls to the LTO backend.  Shall I just change the driver to add
-plugin-opt=-emulated-tls or is the best practice to embed this in the IR?
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