[compiler] Move ensuring deoptimization support to backends.

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index 37af88f62b520c695a5186364633b2dff4375a4b..4be483a88edf88a314095c5d7cefa8262e0b2860 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -322,28 +322,6 @@ OptimizedCompileJob::Status OptimizedCompileJob::CreateGraph() {
     return AbortOptimization(kOptimizedTooManyTimes);
   }
 
-  // Optimization requires a version of fullcode with deoptimization support.
-  // Recompile the unoptimized version of the code if the current version
-  // doesn't have deoptimization support already.
-  // Otherwise, if we are gathering compilation time and space statistics
-  // for hydrogen, gather baseline statistics for a fullcode compilation.
-  bool should_recompile = !info()->shared_info()->has_deoptimization_support();
-  if (should_recompile || FLAG_hydrogen_stats) {
-    base::ElapsedTimer timer;
-    if (FLAG_hydrogen_stats) {
-      timer.Start();
-    }
-    if (!Compiler::EnsureDeoptimizationSupport(info())) {
-      return SetLastStatus(FAILED);
-    }
-    if (FLAG_hydrogen_stats) {
-      isolate()->GetHStatistics()->IncrementFullCodeGen(timer.Elapsed());
-    }
-  }
-
-  DCHECK(info()->shared_info()->has_deoptimization_support());
-  DCHECK(!info()->shared_info()->never_compiled());
-
   if (FLAG_trace_opt) {
     OFStream os(stdout);
     os << "[compiling method " << Brief(*info()->closure()) << " using "