Move hasRuntimeTypeSupport, hasIsolateSupport, and hasFunctionApplySupport to JavaScriptBackend.

pkg/compiler/lib/src/ssa/builder_kernel.dart

Index: pkg/compiler/lib/src/ssa/builder_kernel.dart
diff --git a/pkg/compiler/lib/src/ssa/builder_kernel.dart b/pkg/compiler/lib/src/ssa/builder_kernel.dart
index 6acd15dc3215aeb04e5482829cab9546b950ff30..4c649fdcf774af3cc20ee7decf9c44ab5e249801 100644
--- a/pkg/compiler/lib/src/ssa/builder_kernel.dart
+++ b/pkg/compiler/lib/src/ssa/builder_kernel.dart
@@ -1218,7 +1218,7 @@ class KernelSsaBuilder extends ir.Visitor with GraphBuilder {
       return;
     }
 
-    if (!compiler.hasIsolateSupport) {
+    if (!backend.hasIsolateSupport) {
       // If the isolate library is not used, we just generate code
       // to fetch the static state.
       String name = backend.namer.staticStateHolder;
@@ -1246,7 +1246,7 @@ class KernelSsaBuilder extends ir.Visitor with GraphBuilder {
 
     List<HInstruction> inputs = _visitArguments(invocation.arguments);
 
-    if (!compiler.hasIsolateSupport) {
+    if (!backend.hasIsolateSupport) {
       // If the isolate library is not used, we ignore the isolate argument and
       // just invoke the closure.
       push(new HInvokeClosure(new Selector.callClosure(0),