[turbofan] remove redundant '& 0x1F' for shifts.

src/compiler/ia32/instruction-selector-ia32.cc

Index: src/compiler/ia32/instruction-selector-ia32.cc
diff --git a/src/compiler/ia32/instruction-selector-ia32.cc b/src/compiler/ia32/instruction-selector-ia32.cc
index c242fb431c6f343d99875aea584b7372ffa482c9..dabaa56d17489365953bc218ca89e3d31ac130ce 100644
--- a/src/compiler/ia32/instruction-selector-ia32.cc
+++ b/src/compiler/ia32/instruction-selector-ia32.cc
@@ -524,13 +524,6 @@ static inline void VisitShift(InstructionSelector* selector, Node* node,
     selector->Emit(opcode, g.DefineSameAsFirst(node), g.UseRegister(left),
                    g.UseImmediate(right));
   } else {
-    Int32BinopMatcher m(node);
-    if (m.right().IsWord32And()) {
-      Int32BinopMatcher mright(right);
-      if (mright.right().Is(0x1F)) {
-        right = mright.left().node();
-      }
-    }
     selector->Emit(opcode, g.DefineSameAsFirst(node), g.UseRegister(left),
                    g.UseFixed(right, ecx));
   }
@@ -1096,7 +1089,8 @@ InstructionSelector::SupportedMachineOperatorFlags() {
   if (CpuFeatures::IsSupported(SSE4_1)) {
     return MachineOperatorBuilder::kFloat64Floor |
            MachineOperatorBuilder::kFloat64Ceil |
-           MachineOperatorBuilder::kFloat64RoundTruncate;
+           MachineOperatorBuilder::kFloat64RoundTruncate |
+           MachineOperatorBuilder::kWord32ShiftIsSafe;
   }
   return MachineOperatorBuilder::Flag::kNoFlags;
 }