Remove FLAG_opt_safe_uint32_operations.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 54adfea6c06b2b470bf65c5eb09e535669a51f93..2c4435cc4cb2d1c89917ee5f11e701b7f737cfac 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -2686,9 +2686,8 @@ HInstruction* HGraphBuilder::AddElementAccess(
   DCHECK(val == NULL);
   HLoadKeyed* load = Add<HLoadKeyed>(
       elements, checked_key, dependency, elements_kind, load_mode);
-  if (FLAG_opt_safe_uint32_operations &&
-      (elements_kind == EXTERNAL_UINT32_ELEMENTS ||
-       elements_kind == UINT32_ELEMENTS)) {
+  if (elements_kind == EXTERNAL_UINT32_ELEMENTS ||
+      elements_kind == UINT32_ELEMENTS) {
     graph()->RecordUint32Instruction(load);
   }
   return load;
@@ -4400,7 +4399,7 @@ bool HGraph::Optimize(BailoutReason* bailout_reason) {
   // Must be performed before canonicalization to ensure that Canonicalize
   // will not remove semantically meaningful ToInt32 operations e.g. BIT_OR with
   // zero.
-  if (FLAG_opt_safe_uint32_operations) Run<HUint32AnalysisPhase>();
+  Run<HUint32AnalysisPhase>();
 
   if (FLAG_use_canonicalizing) Run<HCanonicalizePhase>();
 
@@ -10456,8 +10455,7 @@ HValue* HGraphBuilder::BuildBinaryOperation(
         break;
       case Token::SHR:
         instr = AddUncasted<HShr>(left, right);
-        if (FLAG_opt_safe_uint32_operations && instr->IsShr() &&
-            CanBeZero(right)) {
+        if (instr->IsShr() && CanBeZero(right)) {
           graph()->RecordUint32Instruction(instr);
         }
         break;