arm64: Fix emulation of SMULH (was mishandling sign).

MitchBradley / openfirmware

Open Firmware (IEE1275-1994) implementation by its inventor.

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Closed iamtooch closed 2 years ago

iamtooch commented 2 years ago

M* with one negative multiplicand now gives the expected result:

ok -11 21 M* . .
-1 -231