Correctly handle add(hi) when the destination register is the PC.
Fixes #332037.


git-svn-id: svn://svn.valgrind.org/vex/trunk@2838 8f6e269a-dfd6-0310-a8e1-e2731360e62c
LDRD/STRD reg+/-#imm8: allow PC as the base register in the
case "ldrd Rt, Rt2, [PC, #+/-imm8]".  n-i-bz.


git-svn-id: svn://svn.valgrind.org/vex/trunk@2839 8f6e269a-dfd6-0310-a8e1-e2731360e62c