V6 [PATCH] ld: Add --export-dynamic-symbol and --export-dynamic-symbol-list

[H.J. Lu]

Here is the rebased patch.  Nick, Alan, is it OK for master?  Thanks.

--export-dynamic-symbol-list is like a dynamic list, but without
the symbolic property for unspecified symbols.

When creating an executable, --export-dynamic-symbol-list is treated
like --dynamic-list.

When creating a shared library, it is treated like --dynamic-list if
-Bsymbolic or --dynamic-list are used,  otherwise, it is ignored, so
that references to matched symbols will not be bound to the definitions
within the shared library.

-- 
H.J.
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