Allow calling some pieces of the experimental coroutine API

- Calling suspend functions is allowed
- Presence of suspend function type still makes declaration
unusable unless it belongs to a value parameter as a top-level type
containing less then three parameters

Still, warning should be emitted because they will become unsupported in 1.4

 #KT-25683 In Progress

compiler/tests-common/tests/org/jetbrains/kotlin/cli/AbstractCliTest.java

@@ -79,6 +79,7 @@ public abstract class AbstractCliTest extends TestCaseWithTmpdir {
                 .replace(testDataAbsoluteDir, TESTDATA_DIR)
                 .replace(FileUtil.toSystemIndependentName(testDataAbsoluteDir), TESTDATA_DIR)
                 .replace(PathUtil.getKotlinPathsForDistDirectory().getHomePath().getAbsolutePath(), "$PROJECT_DIR$")
+                .replace(PathUtil.getKotlinPathsForDistDirectory().getHomePath().getParentFile().getAbsolutePath(), "$DIST_DIR$")
                 .replace("expected version is " + JvmMetadataVersion.INSTANCE, "expected version is $ABI_VERSION$")
                 .replace("expected version is " + JsMetadataVersion.INSTANCE, "expected version is $ABI_VERSION$")
                 .replace("\\", "/")