[PATCH] Create thunks before regular relocation scan.

[Rafael Espíndola via llvm-commits]

Rebased patch attached.

On 20 July 2016 at 11:12, Rafael Espíndola <rafael.espindola at gmail.com> wrote:
> We will need to do something like this to support range extension
> thunks since that process is iterative.
>
> Doing this also has the advantage that when doing the regular
> relocation scan the offset in the output section is known and we can
> just store that. This reduces the number of times we have to run
> getOffset and I think will allow a more specialized .eh_frame
> representation.
>
> By itself this is already a performance win.
>
> firefox
>   master 7.295045737
>   patch  7.209466989 0.98826892235
> chromium
>   master 4.531254468
>   patch  4.509221804 0.995137623774
> chromium fast
>   master 1.836928973
>   patch  1.823805241 0.992855612714
> the gold plugin
>   master 0.379768791
>   patch  0.380043405 1.00072310839
> clang
>   master 0.642698284
>   patch  0.642215663 0.999249070657
> llvm-as
>   master 0.036665467
>   patch  0.036456225 0.994293213284
> the gold plugin fsds
>   master 0.40395817
>   patch  0.404384555 1.0010555177
> clang fsds
>   master 0.722045545
>   patch  0.720946135 0.998477367518
> llvm-as fsds
>   master 0.03292646
>   patch  0.032759965 0.994943428477
> scylla
>   master 3.427376378
>   patch  3.368316181 0.98276810292
>
>
> Cheers,
> Rafael
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