Take coroutineContext into account in RedundantSuspendModifierInspection

#KT-22651: Fixed

idea/src/org/jetbrains/kotlin/idea/highlighter/KotlinSuspendCallLineMarkerProvider.kt

@@ -13,6 +13,7 @@ import com.intellij.openapi.editor.markup.GutterIconRenderer
 import com.intellij.openapi.progress.ProgressManager
 import com.intellij.psi.PsiElement
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
+import org.jetbrains.kotlin.descriptors.PropertyDescriptor
 import org.jetbrains.kotlin.descriptors.VariableDescriptorWithAccessors
 import org.jetbrains.kotlin.descriptors.accessors
 import org.jetbrains.kotlin.idea.KotlinIcons
@@ -22,6 +23,7 @@ import org.jetbrains.kotlin.psi.*
 import org.jetbrains.kotlin.resolve.BindingContext
 import org.jetbrains.kotlin.resolve.BindingContext.*
 import org.jetbrains.kotlin.resolve.calls.callUtil.getResolvedCall
+import org.jetbrains.kotlin.resolve.calls.checkers.isBuiltInCoroutineContext
 import org.jetbrains.kotlin.resolve.lazy.BodyResolveMode
 
 class KotlinSuspendCallLineMarkerProvider : LineMarkerProvider {
@@ -68,7 +70,7 @@ class KotlinSuspendCallLineMarkerProvider : LineMarkerProvider {
 }
 
 private fun KtExpression.isValidCandidateExpression(): Boolean {
-    if (this is KtOperationReferenceExpression || this is KtForExpression || this is KtProperty) return true
+    if (this is KtOperationReferenceExpression || this is KtForExpression || this is KtProperty || this is KtNameReferenceExpression) return true
     val parent = parent
     if (parent is KtCallExpression && parent.calleeExpression == this) return true
     return false
@@ -94,14 +96,14 @@ fun KtExpression.hasSuspendCalls(bindingContext: BindingContext = analyze(BodyRe
                     val delegatedFunctionDescriptor = bindingContext[DELEGATED_PROPERTY_RESOLVED_CALL, accessor]?.resultingDescriptor
                     delegatedFunctionDescriptor?.isSuspend == true
                 }
-            }
-            else {
+            } else {
                 false
             }
         }
         else -> {
             val resolvedCall = getResolvedCall(bindingContext)
-            (resolvedCall?.resultingDescriptor as? FunctionDescriptor)?.isSuspend == true
+            (resolvedCall?.resultingDescriptor as? FunctionDescriptor)?.isSuspend == true ||
+                    (resolvedCall?.resultingDescriptor as? PropertyDescriptor)?.isBuiltInCoroutineContext() == true
         }
     }
 }

idea/testData/inspectionsLocal/redundantSuspend/coroutineContext.kt

@@ -0,0 +1,8 @@
+// PROBLEM: none
+// WITH_RUNTIME
+
+import kotlin.coroutines.experimental.coroutineContext
+
+<caret>suspend fun test() {
+    coroutineContext
+}

idea/tests/org/jetbrains/kotlin/idea/inspections/LocalInspectionTestGenerated.java

@@ -2961,6 +2961,12 @@ public class LocalInspectionTestGenerated extends AbstractLocalInspectionTest {
             KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("idea/testData/inspectionsLocal/redundantSuspend"), Pattern.compile("^([\\w\\-_]+)\\.(kt|kts)$"), TargetBackend.ANY, true);
         }
 
+        @TestMetadata("coroutineContext.kt")
+        public void testCoroutineContext() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/inspectionsLocal/redundantSuspend/coroutineContext.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("getterDelegate.kt")
         public void testGetterDelegate() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/inspectionsLocal/redundantSuspend/getterDelegate.kt");