Hoisted selection variable declaration in ExprConstant

Author: NagrajMG

clang/lib/AST/ExprConstant.cpp

@@ -11646,19 +11646,18 @@ static bool evalPshufBuiltin(EvalInfo &Info, const CallExpr *Call,
     unsigned LaneBase = (Idx / LaneElts) * LaneElts;
     unsigned LaneIdx = Idx % LaneElts;
     unsigned SrcIdx = Idx;
+    unsigned Sel = (Ctl >> (2 * LaneIdx)) & 0x3;
 
     if (ElemBits == 32) {
-      unsigned Sel = (Ctl >> (2 * LaneIdx)) & 0x3;
       SrcIdx = LaneBase + Sel;
     } else {
       constexpr unsigned HalfSize = 4;
       bool InHigh = LaneIdx >= HalfSize;
       if (!IsShufHW && !InHigh) {
-        unsigned Sel = (Ctl >> (2 * LaneIdx)) & 0x3;
         SrcIdx = LaneBase + Sel;
       } else if (IsShufHW && InHigh) {
         unsigned Rel = LaneIdx - HalfSize;
-        unsigned Sel = (Ctl >> (2 * Rel)) & 0x3;
+        Sel = (Ctl >> (2 * Rel)) & 0x3;
         SrcIdx = LaneBase + HalfSize + Sel;
       }
     }