[LLVMdev] [lld] contentHash in the Reader ?

[Shankar Easwaran]

Hi Nick,

Can we add a atomContentHash for DefinedAtoms when the atoms are being 
created. This can essentially speed up comparisons of atoms especially for

* ICF (Identical code folding)
* Section groups (to identify similiar sections)

Not sure where else this would help. This would essentially be used only 
by the Reader and the Resolver.

There would be no change to the NativeReader/NativeWriter.

Thanks

Shankar Easwaran

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