[turbofan] add ForTesting to pipeline entry points that are for testing only.

test/unittests/compiler/register-allocator-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 "src/base/utils/random-number-generator.h"
 #include "src/compiler/instruction.h"
 #include "src/compiler/pipeline.h"
 #include "test/unittests/test-utils.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
@@ skipping 201 matching lines @@
     completions_.push_back(completion);
     CHECK(current_block_ != nullptr);
     sequence()->EndBlock(current_block_->rpo_number());
     current_block_ = nullptr;
     return instruction_index;
   }
 
   void Allocate() {
     CHECK_EQ(nullptr, current_block_);
     WireBlocks();
-    Pipeline::AllocateRegisters(config(), sequence(), true);
+    Pipeline::AllocateRegistersForTesting(config(), sequence(), true);
   }
 
   TestOperand Imm(int32_t imm = 0) {
     int index = sequence()->AddImmediate(Constant(imm));
     return TestOperand(kImmediate, index);
   }
 
   VReg Parameter(TestOperand output_op = Reg()) {
     VReg vreg = NewReg();
     InstructionOperand* outputs[1]{ConvertOutputOp(vreg, output_op)};
@@ skipping 491 matching lines @@
   StartBlock();
   Return(DefineConstant());
   EndBlock();
 
   Allocate();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8