Improve diagnostics for "not yet supported in inline"

- Tell user what exactly is not supported (e.g., local inline function)
- Reduce diagnostics range to a keyword or an identifier
  where appropriate

 #KT-16223 Fixed Target versions 1.1.50

compiler/testData/diagnostics/tests/inline/localFun.kt

@@ -1,4 +1,4 @@
 fun main(args: Array<String>) {
-    <!NOT_YET_SUPPORTED_IN_INLINE!>inline fun a(){
-    }<!>
+    <!NOT_YET_SUPPORTED_IN_INLINE!>inline<!> fun a(){
+    }
 }