Fix InstructionSelector to handle calls with no (used) output values.

src/compiler/ia32/instruction-selector-ia32.cc

Index: src/compiler/ia32/instruction-selector-ia32.cc
diff --git a/src/compiler/ia32/instruction-selector-ia32.cc b/src/compiler/ia32/instruction-selector-ia32.cc
index 99685f14e58ff106ead5107fc1886f5f6e6b1cdf..ba7425dd0bc3f7cfee033cd8d3bd7b329fc7086b 100644
--- a/src/compiler/ia32/instruction-selector-ia32.cc
+++ b/src/compiler/ia32/instruction-selector-ia32.cc
@@ -638,8 +638,10 @@ void InstructionSelector::VisitCall(Node* node) {
   opcode |= MiscField::encode(descriptor->flags());
 
   // Emit the call instruction.
+  InstructionOperand** first_output =
+      buffer.outputs.size() > 0 ? &buffer.outputs.front() : NULL;
   Instruction* call_instr =
-      Emit(opcode, buffer.outputs.size(), &buffer.outputs.front(),
+      Emit(opcode, buffer.outputs.size(), first_output,
            buffer.instruction_args.size(), &buffer.instruction_args.front());
   call_instr->MarkAsCall();
 }