Visium: align branch absolute instruction for the GR6
This is done in order to avoid a pipeline hazard on the GR6.
gas/
* config/tc-visium.c (md_assemble) <mode_cad>: Align instruction
on 64-bit boundaries for the GR6.
* testsuite/gas/visium/allinsn_gr6.s: Tweak.
* testsuite/gas/visium/allinsn_gr6.d: Likewise.
* testsuite/gas/visium/bra-1.d: New test.
* testsuite/gas/visium/bra-1.s: Likewise.
* testsuite/gas/visium/visium.exp: Run bra-1 test.