Split GenerateNotNullAssertionsTests into standard box and bytecode tests

compiler/testData/codegen/bytecodeText/notNullAssertions/noAssertionForNullableGenericMethod.kt

@@ -0,0 +1,8 @@
+// KOTLIN_CONFIGURATION_FLAGS: +JVM.DISABLE_PARAM_ASSERTIONS
+// IGNORE_BACKEND: JVM_IR
+
+fun <T> foo(a: List<T>) {
+    val t: T = a.get(0)
+}
+
+// 0 kotlin/jvm/internal/Intrinsics