Add Smi support to Shl

src/arm/lithium-codegen-arm.cc

Index: src/arm/lithium-codegen-arm.cc
diff --git a/src/arm/lithium-codegen-arm.cc b/src/arm/lithium-codegen-arm.cc
index 8f28651e326da89bb99e9cb17393c374eb099bd8..d7d3c5eab40481aa1c153053e8b873f914948eb6 100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -1744,7 +1744,14 @@ void LCodeGen::DoShiftI(LShiftI* instr) {
         break;
       case Token::SHL:
         if (shift_count != 0) {
-          __ mov(result, Operand(left, LSL, shift_count));
+          if (instr->hydrogen_value()->representation().IsSmi() &&
+              instr->can_deopt()) {
+            __ mov(result, Operand(left, LSL, shift_count - 1));
+            __ SmiTag(result, result, SetCC);
+            DeoptimizeIf(vs, instr->environment());
+          } else {
+            __ mov(result, Operand(left, LSL, shift_count));
+          }
         } else {
           __ Move(result, left);
         }