[turbofan] Unify pipeline entry for all assemblers.

This uses the same pipeline entry function for all three assemblers
currently supported by TurboFan. The Pipeline::GenerateCodeForCodeStub
is by now generic enough to accommodate all uses.

R=vogelheim@chromium.org

Review URL: https://codereview.chromium.org/1521363003

Cr-Commit-Position: refs/heads/master@{#32837}

src/compiler/fast-accessor-assembler.cc

@@ -175,13 +175,10 @@ MaybeHandle<Code> FastAccessorAssembler::Build() {
   labels_.clear();
 
   // Export the schedule and call the compiler.
-  CompilationInfo info("FastAccessorAssembler", assembler_->isolate(), zone());
   Schedule* schedule = assembler_->Export();
-
-  // TODO(vogelheim): Pipeline should have a dedicated entry point for this
-  //                  assembler.
-  MaybeHandle<Code> code = Pipeline::GenerateCodeForTesting(
-      &info, assembler_->call_descriptor(), assembler_->graph(), schedule);
+  MaybeHandle<Code> code = Pipeline::GenerateCodeForCodeStub(
+      assembler_->isolate(), assembler_->call_descriptor(), assembler_->graph(),
+      schedule, Code::STUB, "FastAccessorAssembler");
 
   // Update state & return.
   state_ = !code.is_null() ? kBuilt : kError;

src/compiler/pipeline.cc

@@ -1210,8 +1210,8 @@ Handle<Code> Pipeline::GenerateCodeForCodeStub(Isolate* isolate,
                                                CallDescriptor* call_descriptor,
                                                Graph* graph, Schedule* schedule,
                                                Code::Kind kind,
-                                               const char* code_stub_name) {
-  CompilationInfo info(code_stub_name, isolate, graph->zone());
+                                               const char* debug_name) {
+  CompilationInfo info(debug_name, isolate, graph->zone());
   info.set_output_code_kind(kind);
 
   // Construct a pipeline for scheduling and code generation.
@@ -1220,7 +1220,7 @@ Handle<Code> Pipeline::GenerateCodeForCodeStub(Isolate* isolate,
   base::SmartPointer<PipelineStatistics> pipeline_statistics;
   if (FLAG_turbo_stats) {
     pipeline_statistics.Reset(new PipelineStatistics(&info, &zone_pool));
-    pipeline_statistics->BeginPhaseKind("interpreter handler codegen");
+    pipeline_statistics->BeginPhaseKind("stub codegen");
   }
 
   Pipeline pipeline(&info);

src/compiler/pipeline.h

@@ -36,7 +36,7 @@ class Pipeline {
                                               CallDescriptor* call_descriptor,
                                               Graph* graph, Schedule* schedule,
                                               Code::Kind kind,
-                                              const char* bytecode_name);
+                                              const char* debug_name);
 
   // Run the pipeline on a machine graph and generate code. If {schedule} is
   // {nullptr}, then compute a new schedule for code generation.