[PATCH] D27415: [ELF] - Replace MergeOutputSection with synthetic input section MergeSection.

[Rafael Espíndola via llvm-commits]

I have spent some time simplifying the patch. It is attached and I
think it is substantially simpler than the previous version.

It can be made simpler still by removing a few hacks to set EntSize
and SHF_MERGE on the output flags. I suggest making that in a followup
patch so as to not change too many tests at once.

This patch should also enable some simplifications in the linker script code.

George, would this work for you? I included a simplified version of
the testcase you mentioned.

Cheers,
Rafael
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