Use common assertion in ir-tests and proper arithmetic flag

compiler/testData/codegen/box/ir/classInitializers.kt

@@ -1,8 +1,6 @@
-fun <T> assertEquals(actual: T, expected: T) {
-    if (actual != expected) {
-        throw java.lang.AssertionError("Assertion failed: $actual != $expected")
-    }
-}
+//WITH_RUNTIME
+//IGNORE_BACKEND: JS_IR
+import kotlin.test.assertEquals
 
 class Test(val x: Int) {
     val y = x + 1

compiler/testData/codegen/box/ir/enumClass.kt

@@ -1,8 +1,7 @@
-fun <T> assertEquals(actual: T, expected: T) {
-    if (actual != expected) {
-        throw java.lang.AssertionError("Assertion failed: $actual != $expected")
-    }
-}
+//WITH_RUNTIME
+//IGNORE_BACKEND: JS_IR
+
+import kotlin.test.assertEquals
 
 enum class Test {
     OK

compiler/testData/codegen/box/ir/enumClass2.kt

@@ -1,8 +1,6 @@
-fun <T> assertEquals(actual: T, expected: T) {
-    if (actual != expected) {
-        throw java.lang.AssertionError("Assertion failed: $actual != $expected")
-    }
-}
+//WITH_RUNTIME
+//IGNORE_BACKEND: JS_IR
+import kotlin.test.assertEquals
 
 enum class TestEnumClass(val x: Int) {
     ZERO

compiler/testData/codegen/box/ir/enumClass3.kt

@@ -1,8 +1,6 @@
-fun <T> assertEquals(actual: T, expected: T) {
-    if (actual != expected) {
-        throw java.lang.AssertionError("Assertion failed: $actual != $expected")
-    }
-}
+//WITH_RUNTIME
+//IGNORE_BACKEND: JS_IR
+import kotlin.test.assertEquals
 
 enum class TestEnumClass {
     ZERO {

compiler/testData/codegen/box/ir/fileClassInitializers.kt

@@ -1,8 +1,6 @@
-fun <T> assertEquals(actual: T, expected: T) {
-    if (actual != expected) {
-        throw java.lang.AssertionError("Assertion failed: $actual != $expected")
-    }
-}
+//WITH_RUNTIME
+//IGNORE_BACKEND: JS_IR
+import kotlin.test.assertEquals
 
 val x = 1
 val y = x + 1

compiler/testData/codegen/box/ir/primitiveNumberComparisons/comparableToDouble.kt

@@ -1,3 +1,6 @@
+// !LANGUAGE: +ProperIeee754Comparisons
+//IGNORE_BACKEND: JS_IR
+
 fun ltDD(x: Comparable<Double>, y: Double) =
     x is Double && x < y
 

compiler/testData/codegen/box/ir/primitiveNumberComparisons/doubleEqeq.kt

@@ -1,3 +1,4 @@
+// !LANGUAGE: +ProperIeee754Comparisons
 fun eqeq(x: Any, y: Any) =
         x is Double && y is Double && x == y
 

compiler/testData/codegen/box/ir/primitiveNumberComparisons/floatEqeq.kt

@@ -1,3 +1,4 @@
+// !LANGUAGE: +ProperIeee754Comparisons
 fun eqeq(x: Any, y: Any) =
         x is Float && y is Float && x == y
 

compiler/testData/codegen/box/ir/primitiveNumberComparisons/mixedNumberTypes.kt

@@ -1,3 +1,4 @@
+// !LANGUAGE: +ProperIeee754Comparisons
 fun ltDI(x: Any, y: Any) =
     x is Double && y is Int && x < y