Remove support for Javascript warnings in the VM.

runtime/vm/intermediate_language_arm.cc

Index: runtime/vm/intermediate_language_arm.cc
diff --git a/runtime/vm/intermediate_language_arm.cc b/runtime/vm/intermediate_language_arm.cc
index a86906adeb1865d69aed1b6941a5c5b94c76ae85..c1a1acdc1123cd2c38e2a9ca37a186ca5a602db3 100644
--- a/runtime/vm/intermediate_language_arm.cc
+++ b/runtime/vm/intermediate_language_arm.cc
@@ -6069,27 +6069,6 @@ void CheckArrayBoundInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
 }
 
 
-static void EmitJavascriptIntOverflowCheck(FlowGraphCompiler* compiler,
-                                           Label* overflow,
-                                           Register result_lo,
-                                           Register result_hi) {
-  // Compare upper half.
-  Label check_lower;
-  __ CompareImmediate(result_hi, 0x00200000);
-  __ b(overflow, GT);
-  __ b(&check_lower, NE);
-
-  __ CompareImmediate(result_lo, 0);
-  __ b(overflow, HI);
-
-  __ Bind(&check_lower);
-  __ CompareImmediate(result_hi, -0x00200000);
-  __ b(overflow, LT);
-  // Anything in the lower part would make the number bigger than the lower
-  // bound, so we are done.
-}
-
-
 LocationSummary* BinaryMintOpInstr::MakeLocationSummary(Zone* zone,
                                                         bool opt) const {
   const intptr_t kNumInputs = 2;
@@ -6167,9 +6146,6 @@ void BinaryMintOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
     default:
       UNREACHABLE();
   }
-  if (FLAG_throw_on_javascript_int_overflow) {
-    EmitJavascriptIntOverflowCheck(compiler, deopt, out_lo, out_hi);
-  }
 }
 
 
@@ -6315,10 +6291,6 @@ void ShiftMintOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
         UNREACHABLE();
     }
   }
-
-  if (FLAG_throw_on_javascript_int_overflow) {
-    EmitJavascriptIntOverflowCheck(compiler, deopt, out_lo, out_hi);
-  }
 }
 
 
@@ -6345,17 +6317,8 @@ void UnaryMintOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   PairLocation* out_pair = locs()->out(0).AsPairLocation();
   Register out_lo = out_pair->At(0).reg();
   Register out_hi = out_pair->At(1).reg();
-
-  Label* deopt = NULL;
-
-  if (FLAG_throw_on_javascript_int_overflow) {
-    deopt = compiler->AddDeoptStub(deopt_id(), ICData::kDeoptUnaryMintOp);
-  }
   __ mvn(out_lo, Operand(left_lo));
   __ mvn(out_hi, Operand(left_hi));
-  if (FLAG_throw_on_javascript_int_overflow) {
-    EmitJavascriptIntOverflowCheck(compiler, deopt, out_lo, out_hi);
-  }
 }