[patch/rfc][pr17902] GC unused parts of mergeable sections

Thu Feb 5 15:26:00 GMT 2015

A new wip version is attached.

In comparison with the previous one, this version

* Handles non-string SHF_MERGE.
* Handles symbol making part of a section referenced.
* Mix fixes.

It reduces the .rodata section in chrome from 6985174 to 6851542 bytes.

Cheers,
Rafael
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