[compiler] Add baseline tier to compilation pipeline.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 095425262a6ee7ed2d893b195e9f7d9b5320c2ee..471a840b5d70da098c6b3a5fe1cf49d8ad344556 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -5859,6 +5859,7 @@ bool SharedFunctionInfo::is_compiled() {
   Builtins* builtins = GetIsolate()->builtins();
   DCHECK(code() != builtins->builtin(Builtins::kCompileOptimizedConcurrent));
   DCHECK(code() != builtins->builtin(Builtins::kCompileOptimized));
+  DCHECK(code() != builtins->builtin(Builtins::kCompileBaseline));
   return code() != builtins->builtin(Builtins::kCompileLazy);
 }
 
@@ -6054,6 +6055,10 @@ bool JSFunction::IsOptimized() {
   return code()->kind() == Code::OPTIMIZED_FUNCTION;
 }
 
+bool JSFunction::IsMarkedForBaseline() {
+  return code() ==
+         GetIsolate()->builtins()->builtin(Builtins::kCompileBaseline);
+}
 
 bool JSFunction::IsMarkedForOptimization() {
   return code() == GetIsolate()->builtins()->builtin(
@@ -6219,6 +6224,7 @@ Object* JSFunction::prototype() {
 bool JSFunction::is_compiled() {
   Builtins* builtins = GetIsolate()->builtins();
   return code() != builtins->builtin(Builtins::kCompileLazy) &&
+         code() != builtins->builtin(Builtins::kCompileBaseline) &&
          code() != builtins->builtin(Builtins::kCompileOptimized) &&
          code() != builtins->builtin(Builtins::kCompileOptimizedConcurrent);
 }