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Remove unnecessary signal handling for low prec mpfr operations. #7879

@robertwb

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@robertwb

_sig_on and _sig_off are more expensive than computing the result itself.


Apply only attachment: trac_7879-RR-signal.2.rebased_to_4.7.2.alpha2.patch to the Sage library.

Component: basic arithmetic

Keywords: sd32

Author: Robert Bradshaw

Reviewer: Alex Ghitza, Mariah Lenox, William Stein

Merged: sage-4.7.2.alpha3

Issue created by migration from https://trac.sagemath.org/ticket/7879

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