Don't use 'iinc' instruction on byte/short/char variables

Android run-time verifier complains when there's any possibility that a
byte/short/char local variable could contain a value not fitting into the
type's limits.

compiler/testData/codegen/box/primitiveTypes/incrementByteCharShort.kt

@@ -0,0 +1,22 @@
+fun byteArg(b: Byte) {}
+fun charArg(c: Char) {}
+fun shortArg(s: Short) {}
+
+fun box(): String {
+    var b = 42.toByte()
+    b++
+    ++b
+    byteArg(b)
+
+    var c = 'x'
+    c++
+    ++c
+    charArg(c)
+
+    var s = 239.toShort()
+    s++
+    ++s
+    shortArg(s)
+
+    return "OK"
+}