FE: Use safe call when searching for suspend modifier

The modifier does not exist, when the parameter type is typealias.

 #KT-35187 Fixed

compiler/testData/diagnostics/tests/coroutines/inlineSuspendTypealias.kt

@@ -0,0 +1,5 @@
+// FIR_IDENTICAL
+// SKIP_TXT
+
+typealias Handler = suspend (String) -> Unit
+suspend inline fun foo(handler: Handler) = Unit