[binutils-gdb] x86/Intel: fix operand checking for MOVSD

[sergiodj+buildbot at sergiodj dot net]

*** TEST RESULTS FOR COMMIT 8325cc6398187c12e0fe04a68a21e4eb5f44fa20 ***

Author: Jan Beulich <jbeulich@novell.com>
Branch: master
Commit: 8325cc6398187c12e0fe04a68a21e4eb5f44fa20

x86/Intel: fix operand checking for MOVSD

The dual purpose mnemonic (string move vs scalar double move) breaks
the assumption that the isstring flag would be set on both the first
and last entry in the current set of templates, which results in bogus
or missing diagnostics for the string move variant of the mnemonic.
Short of mostly rewriting i386_index_check() and its interaction with
the rest of the code, simply shrink the template set to just string
instructions when encountering the second memory operand, and run
i386_index_check() a second time for the first memory operand after
that reduction.