[patch] First step to fix pr11866 during LTO

[Rafael Espíndola]

> When a new API is added to llvm-c/lto.h, please bump LTO_API_VERSION
> so that the linker can configure itself to use the new function.

Done.

> But, is there a better name than “lto_codegen_add_symtab_symbol()”.  That
> name has no obvious meaning.  All symbols are symbol table symbols…
> I had to go back and re-read the email thread to figure out what it was
> supposed to do again.
>
> How about something like (existing plus new):
>
> /**
>  * Tells LTO optimization passes that this symbol must be preserved
>  * because it is referenced by native code or a command line option.
>  */
> void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg, const char* symbol);
>
> /**
>  * Tells LTO optimization passes that a dynamic shared library is being
>  * built which exports all global symbols by default.  And that unless C++
>  * semantics allow the symbol to be completely optimized away, it should
>  * remain so it can be exported by the shared library.
>  */
> void lto_codegen_add_dso_symbol(lto_code_gen_t cg, const char *symbol);

I like it. I have propagated the s/symtab/dso/ name change and tweaked
some comments. A new patch is attached.

Cheers,
Rafael
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