[PATCH] [LTO API] add lto_codegen_set_should_internalize.

[Manman Ren]

When debugging LTO issues with ld64, we use -save-temps to save the merged

optimized bitcode file, then invoke ld64 again on the single bitcode file.

The saved bitcode file is already internalized, so we can call

lto_codegen_set_should_internalize and skip running internalization again.



Thanks for reviewing!


Manman
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