Fix annotation deserialization on suspend functions

Use proper initial/frontend version of suspend descriptor
when writing METHOD_FOR_FUNCTION, because serializer uses this version

Also this commit contains adjustments of neighboring code to the describe
change

 #KT-16093 Fixed

compiler/testData/loadJava/compiledKotlinWithStdlib/coroutines/annotatedSuspendFun.kt

@@ -0,0 +1,5 @@
+//ALLOW_AST_ACCESS
+package test
+
+annotation class Anno(val t: String)
+@Anno("foo") suspend fun foo() {}

compiler/testData/loadJava/compiledKotlinWithStdlib/coroutines/annotatedSuspendFun.txt

@@ -0,0 +1,9 @@
+package test
+
+@test.Anno(t = "foo") public suspend fun foo(): kotlin.Unit
+
+public final annotation class Anno : kotlin.Annotation {
+    /*primary*/ public constructor Anno(/*0*/ t: kotlin.String)
+    public final val t: kotlin.String
+        public final fun <get-t>(): kotlin.String
+}