gas: x86: ginsn: adjust ginsns for certain lea ops

A review comment on the SCFI V4 series was to handle ginsn creation for
certain lea opcodes more precisely.

Specifically, we should preferably handle the following two cases of lea
opcodes similarly:
  - #1 lea with "index register and scale factor of 1, but no base
    register",
  - #2 lea with "no index register, but base register present".

Currently, a ginsn of type GINSN_TYPE_OTHER is generated for the
case of #1 above.  For #2, however, the lea insn is translated to either
a GINSN_TYPE_ADD or GINSN_TYPE_MOV depending on whether the immediate
for displacement is non-zero or not respectively.

Change the handling in x86_ginsn_lea so that both of the above lea
manifestations are handled similarly.

While at it, remove the code paths creating GINSN_TYPE_OTHER altogether
from the function.  It makes sense to piggy back on the
x86_ginsn_unhandled code path to create GINSN_TYPE_OTHER if the
destination register is interesting.  This was also suggested in one of
the previous review rounds;  the other functions already follow that
model, so this keeps functions symmetrical looking.

gas/
	* gas/config/tc-i386.c (x86_ginsn_lea): Handle select lea ops with
	no base register similar to the case of no index register.  Remove
	creation of GINSN_TYPE_OTHER from the function.

gas/testsuite/
	* gas/scfi/x86_64/ginsn-lea-1.l: New test.
	* gas/scfi/x86_64/ginsn-lea-1.s: Likewise.
	* gas/scfi/x86_64/scfi-x86-64.exp: Add new test.

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