Add support for the PPC isel instruction.

The isel (integer select) instruction is supported on the 440 and A2
embedded cores and on the POWER7.

llvm-svn: 159045
diff --git a/llvm/lib/Target/PowerPC/PPCInstr64Bit.td b/llvm/lib/Target/PowerPC/PPCInstr64Bit.td
index e83fd72..a2bd55f 100644
--- a/llvm/lib/Target/PowerPC/PPCInstr64Bit.td
+++ b/llvm/lib/Target/PowerPC/PPCInstr64Bit.td
@@ -497,6 +497,10 @@
                      "rlwinm $rA, $rS, $SH, $MB, $ME", IntGeneral,
                      []>;
 
+def ISEL8   : AForm_1<31, 15,
+                     (outs G8RC:$rT), (ins G8RC:$rA, G8RC:$rB, pred:$cond),
+                     "isel $rT, $rA, $rB, $cond", IntGeneral,
+                     []>;
 }  // End FXU Operations.