Put default value (null or zero) to slot for uninitialized values

This way range of the variable is correct in LVT.
 #KT-24672 Fixed

compiler/testData/codegen/bytecodeText/localInitializationLVT/generics.kt

@@ -0,0 +1,16 @@
+// IGNORE_BACKEND: JVM_IR
+
+inline fun <reified T> foo(default: T): T {
+    val t: T
+    run {
+        t = default
+    }
+    return t
+}
+
+fun test() {
+    foo(0.0f)
+}
+
+// 2 ASTORE 1
+// 1 LOCALVARIABLE t\$iv Ljava/lang/Object; L2 L11 1