Tail call from TurboFan into select runtime calls

src/compiler/js-context-relaxation.cc

Index: src/compiler/js-context-relaxation.cc
diff --git a/src/compiler/js-context-relaxation.cc b/src/compiler/js-context-relaxation.cc
index 0ca3c0c9d3ccb7fd6872afd161f601324b6be247..4072ae82ef0c668949aaba9cdf76af0c31a26331 100644
--- a/src/compiler/js-context-relaxation.cc
+++ b/src/compiler/js-context-relaxation.cc
@@ -14,6 +14,20 @@ namespace compiler {
 
 Reduction JSContextRelaxation::Reduce(Node* node) {
   switch (node->opcode()) {
+    case IrOpcode::kJSCallRuntime: {
+      const CallRuntimeParameters& p = CallRuntimeParametersOf(node->op());
+      const Runtime::Function* fun = Runtime::FunctionForId(p.id());
+      switch (fun->function_id) {
+#define IC_CASE(name, number_of_args, result_size) \
+  case Runtime::k##name:                           \
+    break;
+        FOR_EACH_INTRINSIC_IC(IC_CASE)
+#undef IC_CASE
+        default:
+          return NoChange();
+      }
+    }
+    // Fall through
     case IrOpcode::kJSCallFunction:
     case IrOpcode::kJSToNumber: {
       Node* frame_state = NodeProperties::GetFrameStateInput(node, 0);