[turbofan] Allow tests to enable/disable instruction scheduling.

test/unittests/compiler/instruction-selector-unittest.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "test/unittests/compiler/instruction-selector-unittest.h"
 
 #include "src/code-factory.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/schedule.h"
 #include "src/flags.h"
@@ skipping 23 matching lines @@
   size_t const node_count = graph()->NodeCount();
   EXPECT_NE(0u, node_count);
   Linkage linkage(call_descriptor());
   InstructionBlocks* instruction_blocks =
       InstructionSequence::InstructionBlocksFor(test_->zone(), schedule);
   InstructionSequence sequence(test_->isolate(), test_->zone(),
                                instruction_blocks);
   SourcePositionTable source_position_table(graph());
   InstructionSelector selector(test_->zone(), node_count, &linkage, &sequence,
                                schedule, &source_position_table, nullptr,
-                               source_position_mode, features);
+                               source_position_mode, features,
+                               InstructionSelector::kDisableScheduling);
   selector.SelectInstructions();
   if (FLAG_trace_turbo) {
     OFStream out(stdout);
     PrintableInstructionSequence printable = {RegisterConfiguration::Turbofan(),
                                               &sequence};
     out << "=== Code sequence after instruction selection ===" << std::endl
         << printable;
   }
   Stream s;
   s.virtual_registers_ = selector.GetVirtualRegistersForTesting();
@@ skipping 566 matching lines @@
   EXPECT_EQ(s.ToVreg(context2), s.ToVreg(call_instr->InputAt(14)));
   // Continuation.
 
   EXPECT_EQ(kArchRet, s[index++]->arch_opcode());
   EXPECT_EQ(index, s.size());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8