JVM: do not write trivial SMAPs to classes outside inline funs

where trivial == those that map the file to itself.

compiler/testData/codegen/boxInline/smap/inlineOnly/stdlibInlineOnlyOneLine.kt

@@ -0,0 +1,16 @@
+// FILE: 1.kt
+package test
+
+@Suppress("INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
+@kotlin.internal.InlineOnly
+inline fun <T, R> T.myLet(block: (T) -> R) = block(this)
+
+// FILE: 2.kt
+import test.*
+
+fun box(): String {
+    val k = "".myLet { it + "K" }
+    return "O".myLet(fun (it: String): String { return it + k })
+}
+
+// FILE: 2.smap