Regression tests for some old EA reports

EA-35953, EA-35743

compiler/testData/codegen/intrinsics/ea35953.kt

@@ -0,0 +1,6 @@
+fun box(): String {
+    if (12.toString() equals "13") {
+        return "Fail"
+    }
+    return "OK"
+}

compiler/testData/codegen/regressions/ea35743.kt

@@ -0,0 +1,6 @@
+val Int.test = "test"
+
+fun box(): String {
+    val x = "a ${1.test}"
+    return if (x == "a test") "OK" else "Fail $x"
+}