target-ppc: fix rlwimi, rlwinm, rlwnm for Clang-9

target-ppc: fix rlwimi, rlwinm, rlwnm for Clang-9

Starting with Clang v9, -Wtype-limits is implemented and triggers a
few "result of comparison is always true" errors when compiling PPC32
targets.

The comparisons seem to be necessary only on PPC64, since the
else branch in PPC32 only has a "g_assert_not_reached();" in all cases.

This patch restructures the code so that the actual if/else is done on a
local flag variable, that is set accordingly for PPC64, and always
true for PPC32.

Signed-off-by: Daniele Buono <[email protected]>
Message-Id: <20200505183818[email protected]>
Signed-off-by: David Gibson <[email protected]>