Optimize Edwards to Montgomery conversions#1301
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daxpedda wants to merge 1 commit intoRustCrypto:masterfrom
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Optimize Edwards to Montgomery conversions#1301daxpedda wants to merge 1 commit intoRustCrypto:masterfrom
daxpedda wants to merge 1 commit intoRustCrypto:masterfrom
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The current Edwards to Montgomery conversions are unnecessarily expensive.
This PR replaces them with simpler ones, including one that saves more operations when going directly from Edwards projective form to Montgomery.
Split off #1291.