Allow uint32 value on optimized frames if they are consumed by safe operations.

src/arm/lithium-arm.h

Index: src/arm/lithium-arm.h
diff --git a/src/arm/lithium-arm.h b/src/arm/lithium-arm.h
index 9425e9695b3fb640a8b52b7304d2e956ef8a559f..ada548189bd5e44bb05c606b37f8cbd3e7ed0493 100644
--- a/src/arm/lithium-arm.h
+++ b/src/arm/lithium-arm.h
@@ -108,6 +108,7 @@ class LCodeGen;
   V(InstanceOfKnownGlobal)                      \
   V(InstructionGap)                             \
   V(Integer32ToDouble)                          \
+  V(Uint32ToDouble)                             \
   V(InvokeFunction)                             \
   V(IsConstructCallAndBranch)                   \
   V(IsNilAndBranch)                             \
@@ -137,6 +138,7 @@ class LCodeGen;
   V(MulI)                                       \
   V(NumberTagD)                                 \
   V(NumberTagI)                                 \
+  V(NumberTagU)                                 \
   V(NumberUntagD)                               \
   V(ObjectLiteral)                              \
   V(OsrEntry)                                   \
@@ -1605,6 +1607,16 @@ class LInteger32ToDouble: public LTemplateInstruction<1, 1, 0> {
 };
 
 
+class LUint32ToDouble: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LUint32ToDouble(LOperand* value) {
+    inputs_[0] = value;
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(Uint32ToDouble, "uint32-to-double")
+};
+
+
 class LNumberTagI: public LTemplateInstruction<1, 1, 0> {
  public:
   explicit LNumberTagI(LOperand* value) {
@@ -1615,6 +1627,16 @@ class LNumberTagI: public LTemplateInstruction<1, 1, 0> {
 };
 
 
+class LNumberTagU: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LNumberTagU(LOperand* value) {
+    inputs_[0] = value;
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(NumberTagU, "number-tag-u")
+};
+
+
 class LNumberTagD: public LTemplateInstruction<1, 1, 2> {
  public:
   LNumberTagD(LOperand* value, LOperand* temp1, LOperand* temp2) {