Change parsing of statements starting with annotations

If a block statement starts with annotations treat them as they
belong to node of the statement rather than to the closest prefix expression

 #KT-10210 Fixed

compiler/testData/psi/annotation/at/blockLevelExpressions.kt

@@ -0,0 +1,34 @@
+fun foo() {
+    @ann0
+    var x0 = foo0()
+
+    @ann1
+    x1 = foo1()
+
+    @ann2
+    x2 += foo2()
+
+    for (i in 1..100) {
+        @ann3
+        x3 += foo3()
+    }
+
+    for (i in 1..100)
+        // annotation is attached to `x4`
+        @ann4
+        x4 += foo4()
+
+    a.filter {
+        @ann5
+        x5 += foo5()
+    }
+
+    @ann6
+    x6 ?: x7 infix x9 + 10
+
+    @ann7
+    return 1
+
+    @ann8
+    x as Type
+}