Initial split of precompilation code from compiler.cc

runtime/vm/flow_graph_compiler.cc

Index: runtime/vm/flow_graph_compiler.cc
diff --git a/runtime/vm/flow_graph_compiler.cc b/runtime/vm/flow_graph_compiler.cc
index 69640c4eef619863753c5f73f78c4fe4911c00b8..f399c646268df82eed3e834a5f1dac07efa5a28d 100644
--- a/runtime/vm/flow_graph_compiler.cc
+++ b/runtime/vm/flow_graph_compiler.cc
@@ -934,7 +934,7 @@ Label* FlowGraphCompiler::AddDeoptStub(intptr_t deopt_id,
     return &intrinsic_slow_path_label_;
   }
 
-  // No deoptimization allowed when 'always_optimize' is set.
+  // No deoptimization allowed when 'FLAG_precompilation' is set.
   if (FLAG_precompilation) {
     if (FLAG_trace_compiler) {
       THR_Print(
@@ -982,7 +982,7 @@ void FlowGraphCompiler::FinalizePcDescriptors(const Code& code) {
 
 
 RawArray* FlowGraphCompiler::CreateDeoptInfo(Assembler* assembler) {
-  // No deopt information if we 'always_optimize' (no deoptimization allowed).
+  // No deopt information if we precompile (no deoptimization allowed).
   if (FLAG_precompilation) {
     return Array::empty_array().raw();
   }