[PowerAssert] Add codegen tests

plugins/power-assert/testData/codegen/parameters/VarargParameter.box.txt

@@ -0,0 +1,9 @@
+Assertion failed
+assert(listOf("a", "b", "c") == listOf(i++, i++, i++))
+       |                     |  |      |    |    |
+       |                     |  |      |    |    2
+       |                     |  |      |    1
+       |                     |  |      0
+       |                     |  [0, 1, 2]
+       |                     false
+       [a, b, c]

plugins/power-assert/testData/codegen/parameters/VarargParameter.kt

@@ -0,0 +1,4 @@
+fun box() = expectThrowableMessage {
+    var i = 0
+    assert(listOf("a", "b", "c") == listOf(i++, i++, i++))
+}