[PowerPC] Revert commit r339779

This commit has caused failures in some internal benchmarks. Temporarily
reverting this patch until the issue can be diagnosed and fixed.

llvm-svn: 340740
diff --git a/llvm/lib/Target/PowerPC/PPCInstrVSX.td b/llvm/lib/Target/PowerPC/PPCInstrVSX.td
index 3a792d8..781a327 100644
--- a/llvm/lib/Target/PowerPC/PPCInstrVSX.td
+++ b/llvm/lib/Target/PowerPC/PPCInstrVSX.td
@@ -870,8 +870,7 @@
                              "xxpermdi $XT, $XA, $XA, $DM", IIC_VecPerm, []>;
   def XXSEL : XX4Form<60, 3,
                       (outs vsrc:$XT), (ins vsrc:$XA, vsrc:$XB, vsrc:$XC),
-                      "xxsel $XT, $XA, $XB, $XC", IIC_VecPerm,
-                      [(set v4i32:$XT, (vselect v4i32:$XC, v4i32:$XB, v4i32:$XA))]>;
+                      "xxsel $XT, $XA, $XB, $XC", IIC_VecPerm, []>;
 
   def XXSLDWI : XX3Form_2<60, 2,
                        (outs vsrc:$XT), (ins vsrc:$XA, vsrc:$XB, u2imm:$SHW),