Abort optimization when debugger is turned on.

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index 3da686aad11b6a5a6bf1ff3b571f1fce323beb39..f643b9dcec30990f77cd48ac7923ad211600b00e 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -1058,6 +1058,9 @@ void Compiler::InstallOptimizedCode(OptimizingCompiler* optimizing_compiler) {
   } else if (status != OptimizingCompiler::SUCCEEDED) {
     info->set_bailout_reason("failed/bailed out last time");
     status = optimizing_compiler->AbortOptimization();
+  } else if (isolate->debugger()->IsDebuggerActive()) {
+    info->set_bailout_reason("debugger is active");
+    status = optimizing_compiler->AbortOptimization();
   } else {
     status = optimizing_compiler->GenerateAndInstallCode();
     ASSERT(status == OptimizingCompiler::SUCCEEDED ||