x86: fix operand size checking

x86: fix operand size checking

Currently mov to/from control, debug, and test register insns accept any
size GPR operand (general pattern: templates with D set and both
operands being registers in distinct register files). This is due to
improper checking of the reverse case, including not informing the
caller whether a straight and/or reverse match was successful.

The helper functions need to be told two indexes: One to index the given
operand types array, and the other to index the template one. The caller
must attempt a further straight match only if the function reported a
straight match (and respectively for reverse matches).