make FunctionCodegen skip method bodies we don't need, which avoids problems with inlining methods inside methods we don't need

KT-33604

plugins/jvm-abi-gen/testData/compile/inlineCapture/app/app.kt

@@ -0,0 +1,7 @@
+package app
+
+import lib.*
+
+fun runAppAndReturnOk(): String {
+    return inlineCapture("OK")
+}

plugins/jvm-abi-gen/testData/compile/inlineCapture/lib/lib.kt

@@ -0,0 +1,10 @@
+package lib
+
+fun inlineCapture(s: String): String {
+    return with(StringBuilder()) {
+        val o = object {
+            override fun toString() = s
+        }
+        append(o)
+    }.toString()
+}