JVM IR: Start fake variables for default lambdas after initialization

KT-52702

compiler/testData/codegen/box/defaultArguments/kt52702.kt

@@ -0,0 +1,24 @@
+// IGNORE_BACKEND: JS
+// Check that local variables for inline functions and inline default lambdas start
+// after they are initialized.
+
+inline fun spray() {
+    val a = Any()
+    val b = Any()
+    val c = Any()
+    val d = Any()
+    val e = Any()
+}
+
+inline fun f(block: () -> String = { "OK" }): String = block()
+
+fun box(): String {
+    // On the JVM, this call adds some locals with reference types to the LVT
+    // which end after the call returns.
+    spray()
+    // When inlining `f` we'll reuse the same slots that previously contained
+    // locals with reference types for the $i$f$f and $i$a$-f-... variables.
+    // Since these locals have integer types D8 would produce a warning if they
+    // started before being initialized, which would cause the test to fail.
+    return f()
+}