Fix for KT-12125: Wrong increment/decrement on Byte/Char/Short.MAX_VALUE/MIN_VALUE

#KT-12125 Fixed

compiler/testData/codegen/box/intrinsics/kt12125.kt

@@ -0,0 +1,17 @@
+fun test(i: Int): Int {
+    return i
+}
+
+fun box(): String {
+    var b = Byte.MAX_VALUE
+    b++
+    var result = test(b.toInt())
+    if (result != Byte.MIN_VALUE.toInt()) return "fail 1: $result"
+
+    var s = Short.MIN_VALUE
+    s--
+    result = test(s.toInt())
+    if (result != Short.MAX_VALUE.toInt()) return "fail 2: $result"
+
+    return "OK"
+}

compiler/testData/codegen/box/intrinsics/kt12125_2.kt

@@ -0,0 +1,16 @@
+fun box(): String {
+    var aByte: Byte? = 0
+    var bByte: Byte = 0
+
+    if (aByte != null) aByte--
+    bByte--
+    if (aByte != bByte) return "Failed post-decrement Byte: $aByte != $bByte"
+
+    if (aByte != null) aByte++
+    bByte++
+    if (aByte != bByte) return "Failed post-increment Byte: $aByte != $bByte"
+
+    aByte = null
+
+    return "OK"
+}

compiler/testData/codegen/box/intrinsics/kt12125_inc.kt

@@ -0,0 +1,15 @@
+fun test(i: Int): Int {
+    return i
+}
+
+fun box(): String {
+    var b = Byte.MAX_VALUE
+    var result = test(b.inc().toInt())
+    if (result != Byte.MIN_VALUE.toInt()) return "fail 1: $result"
+
+    var s = Short.MAX_VALUE
+    result = test(s.inc().toInt())
+    if (result != Short.MIN_VALUE.toInt()) return "fail 2: $result"
+
+    return "OK"
+}

compiler/testData/codegen/box/intrinsics/kt12125_inc_2.kt

@@ -0,0 +1,20 @@
+fun test(i: Int): Int {
+    return i
+}
+
+fun box(): String {
+    var aByte: Byte? = 0
+    var bByte: Byte = 0
+
+    if (aByte != null) {
+        if (aByte.dec() != bByte.dec()) return "Failed post-decrement Byte: ${aByte.dec()} != ${bByte.dec()}"
+    }
+
+    if (aByte != null) {
+        if (aByte.inc() != bByte.inc()) return "Failed post-increment Byte: ${aByte.inc()} != ${bByte.inc()}"
+    }
+
+    aByte = null
+
+    return "OK"
+}