wip-Emit import call expression for commonjs

tests/cases/conformance/es2018/dynamicImport/importCallExpressionInCJS1.ts

@@ -0,0 +1,11 @@
+// @module: commonjs
+// @target: esnext
+// @filename: 0.ts
+export function foo() { return "foo"; }
+
+// @filename: 1.ts
+import("./0");
+var p1 = import("./0");
+p1.then(zero => {
+    return zero.foo();
+});

tests/cases/conformance/es2018/dynamicImport/importCallExpressionInCJS2.ts

@@ -0,0 +1,19 @@
+// @module: commonjs
+// @target: esnext
+// @filename: 0.ts
+export function foo() { return "foo"; }
+
+// @filename: 1.ts
+export function backup() { return "backup"; }
+
+// @filename: 2.ts
+async function compute(promise: Promise<any>) {
+    let j = await promise;
+    if (!j) {
+        j = await import("./1");
+        return j.backup();
+    }
+    return j.foo();
+}
+
+compute(import("./0"));