Make Zone::allocation_size work with parallel zones.

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index 7b0b92152931dc3da1e9036cc585b631de054c5c..cfdec8ffb9915b45dce9439c8c1880c52d17ce61 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -367,7 +367,7 @@ 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());
+    HPhase phase(HPhase::kFullCodeGen, isolate(), info()->zone());
     CompilationInfoWithZone unoptimized(info()->shared_info());
     // Note that we use the same AST that we will use for generating the
     // optimized code.