[PATCH] [aarch64] Implemented reciprocal square root (rsqrt) estimation in -ffast-math

[Benedikt Huber]

> 
> Benedikt , I have ICE for 444.namd with your patch,  not sure if something wrong in my local tree.

Venkat, now I could reproduce it.
Strangely it does not happen with -flto.
I will try to find out the reason for that.

Thank you for the catch,
Benedikt

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