Unbox inline classes after safe calls if needed

compiler/testData/codegen/bytecodeText/inlineClasses/unboxInlineClassAfterSafeCall.kt

@@ -0,0 +1,20 @@
+// !LANGUAGE: +InlineClasses
+
+inline class Foo(val x: Int) {
+    fun member() {}
+}
+
+fun Foo.extension() {}
+fun <T> T.genericExtension() {}
+
+fun test(f: Foo?) {
+    f?.member() // unbox
+    f?.extension() // unbox
+    f?.genericExtension()
+}
+
+// 0 INVOKESTATIC Foo\$Erased.box
+// 2 INVOKEVIRTUAL Foo.unbox
+
+// 0 valueOf
+// 0 intValue