Introduce 'fail' method to throw AssertionError with cause

#KT-37804

(cherry picked from commit 0449df5f64b1c2f639786d1865979662331f56d6)

runtime/src/main/kotlin/kotlin/test/Assertions.kt

@@ -38,4 +38,10 @@ internal actual fun <T : Throwable> checkResultIsFailure(exceptionClass: KClass<
     )
 }
 
+/** Platform-specific construction of AssertionError with cause */
+@Suppress("NOTHING_TO_INLINE")
+internal actual inline fun AssertionErrorWithCause(message: String?, cause: Throwable?): AssertionError =
+        AssertionError(message, cause)
+
+
 internal actual fun lookupAsserter(): Asserter = DefaultAsserter