[turbofan] Add Int32AddWithOverflow machine operator.

src/compiler/arm/code-generator-arm.cc

Index: src/compiler/arm/code-generator-arm.cc
diff --git a/src/compiler/arm/code-generator-arm.cc b/src/compiler/arm/code-generator-arm.cc
index 956fbbde8cc3a1d6f9a4fd64e9c6b1ce8fd2e707..8b7f9c117fbb96a435ef0d265456e25919936ae2 100644
--- a/src/compiler/arm/code-generator-arm.cc
+++ b/src/compiler/arm/code-generator-arm.cc
@@ -501,6 +501,12 @@ void CodeGenerator::AssembleArchBranch(Instruction* instr,
     case kUnsignedGreaterThan:
       __ b(hi, tlabel);
       break;
+    case kOverflow:
+      __ b(vs, tlabel);
+      break;
+    case kNotOverflow:
+      __ b(vc, tlabel);
+      break;
   }
   if (!fallthru) __ b(flabel);  // no fallthru to flabel.
   __ bind(&done);
@@ -513,9 +519,11 @@ void CodeGenerator::AssembleArchBoolean(Instruction* instr,
   ArmOperandConverter i(this, instr);
   Label done;
 
-  // Materialize a full 32-bit 1 or 0 value.
+  // Materialize a full 32-bit 1 or 0 value. The result register is always the
+  // last output of the instruction.
   Label check;
-  Register reg = i.OutputRegister();
+  ASSERT_NE(0, instr->OutputCount());
+  Register reg = i.OutputRegister(instr->OutputCount() - 1);
   Condition cc = kNoCondition;
   switch (condition) {
     case kUnorderedEqual:
@@ -578,6 +586,12 @@ void CodeGenerator::AssembleArchBoolean(Instruction* instr,
     case kUnsignedGreaterThan:
       cc = hi;
       break;
+    case kOverflow:
+      cc = vs;
+      break;
+    case kNotOverflow:
+      cc = vc;
+      break;
   }
   __ bind(&check);
   __ mov(reg, Operand(0));