Reserve yield if it isn't function call.

idea/testData/quickfix/yieldUnsupported/yieldAsSimpleName.kt

@@ -0,0 +1,6 @@
+// "Migrate unsupported yield syntax" "true"
+object yield {}
+
+fun test() {
+    val foo = yie<caret>ld
+}

idea/testData/quickfix/yieldUnsupported/yieldAsSimpleName.kt.after

@@ -0,0 +1,6 @@
+// "Migrate unsupported yield syntax" "true"
+object yield {}
+
+fun test() {
+    val foo = `yield`
+}

idea/testData/quickfix/yieldUnsupported/yieldBeforeLambda.kt

@@ -0,0 +1,8 @@
+// "Migrate unsupported yield syntax" "true"
+object yield {
+    operator fun invoke(f: () -> Unit) = f()
+}
+
+fun test() {
+    yie<caret>ld {  }
+}

idea/testData/quickfix/yieldUnsupported/yieldBeforeLambda.kt.after

@@ -0,0 +1,8 @@
+// "Migrate unsupported yield syntax" "true"
+object yield {
+    operator fun invoke(f: () -> Unit) = f()
+}
+
+fun test() {
+    yield() {  }
+}