[Bug ld/18414] TOC optimization bug (ignoring data deps on addis/ld -> nop/ld opt)

[hfinkel at anl dot gov]

https://sourceware.org/bugzilla/show_bug.cgi?id=18414

--- Comment #6 from Hal Finkel <hfinkel at anl dot gov> ---
(In reply to Alan Modra from comment #1)
> True, ld will do this.  However, the optimization is relying on gcc to
> generate code that can be optimized this way..  So I'm assuming the example
> code was from llvm or assembly.
> 
> gcc ensures that the optimization is valid by adding a dependency on r2 to
> the low part of the address calculation.

LLVM updated to add extra r2 read dependencies on instructions with 
@address@hidden
relocations in r237556.

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