[tests] Create canonicalized handle scope for Turbofan.

Change-Id: I76a792638b58f0bdc0a6a04c912d816ebf04718c
Reviewed-on: https://chromium-review.googlesource.com/725320Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48664}

test/cctest/compiler/test-run-bytecode-graph-builder.cc

@@ -121,6 +121,12 @@ class BytecodeGraphTester {
     Handle<SharedFunctionInfo> shared(function->shared());
     CompilationInfo compilation_info(&zone, function->GetIsolate(), shared,
                                      function);
+
+    // Compiler relies on canonicalized handles, let's create
+    // a canonicalized scope and migrate existing handles there.
+    CanonicalHandleScope canonical(isolate_);
+    compilation_info.ReopenHandlesInNewHandleScope();
+
     Handle<Code> code = Pipeline::GenerateCodeForTesting(&compilation_info);
     function->set_code(*code);