Drop (mis)use of HPhase in full code gen.

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index 7d5fd930f844de4a632cdfcdae5c0810f925cd14..2539f7d7d276524b853e319ac53448451ba56ccf 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -367,7 +367,10 @@ OptimizingCompiler::Status OptimizingCompiler::CreateGraph() {
   // performance of the hydrogen-based compiler.
   bool should_recompile = !info()->shared_info()->has_deoptimization_support();
   if (should_recompile || FLAG_hydrogen_stats) {
-    HPhase phase(HPhase::kFullCodeGen, isolate(), info()->zone());
+    int64_t start_ticks = 0;
+    if (FLAG_hydrogen_stats) {
+      start_ticks = OS::Ticks();
+    }
     CompilationInfoWithZone unoptimized(info()->shared_info());
     // Note that we use the same AST that we will use for generating the
     // optimized code.
@@ -384,6 +387,10 @@ OptimizingCompiler::Status OptimizingCompiler::CreateGraph() {
       Compiler::RecordFunctionCompilation(
           Logger::LAZY_COMPILE_TAG, &unoptimized, shared);
     }
+    if (FLAG_hydrogen_stats) {
+      int64_t ticks = OS::Ticks() - start_ticks;
+      isolate()->GetHStatistics()->IncrementFullCodeGen(ticks);
+    }
   }
 
   // Check that the unoptimized, shared code is ready for