when: emit lookupswitch/tableswitch if possible

A lookupswitch or tableswitch can be used if all conditions are equality
checks to constants. To be more specific, it can be done if:
  1. All conditions are CALL 'EQEQ(Any?, Any?)': Boolean
  2. All types of variables involved in comparison are in the same group
     of Char/Byte/Short/Int, String or enum.
  3. All arg0 refer to the same value.
  4. All arg1 are IrConst<*>.

Change-Id: Ifd7cb618395f6c5cc64601018b446f0bb7f5891c

compiler/tests/org/jetbrains/kotlin/codegen/BytecodeTextTestGenerated.java

@@ -3353,6 +3353,11 @@ public class BytecodeTextTestGenerated extends AbstractBytecodeTextTest {
             runTest("compiler/testData/codegen/bytecodeText/when/kt18818.kt");
         }
 
+        @TestMetadata("lookupSwitch.kt")
+        public void testLookupSwitch() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/when/lookupSwitch.kt");
+        }
+
         @TestMetadata("noBoxingInDefaultWhenWithSpecialCases.kt")
         public void testNoBoxingInDefaultWhenWithSpecialCases() throws Exception {
             runTest("compiler/testData/codegen/bytecodeText/when/noBoxingInDefaultWhenWithSpecialCases.kt");
@@ -3393,6 +3398,11 @@ public class BytecodeTextTestGenerated extends AbstractBytecodeTextTest {
             runTest("compiler/testData/codegen/bytecodeText/when/subjectValInStringWhenHasLocalVariableSlot.kt");
         }
 
+        @TestMetadata("tableSwitch.kt")
+        public void testTableSwitch() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/when/tableSwitch.kt");
+        }
+
         @TestMetadata("whenNull.kt")
         public void testWhenNull() throws Exception {
             runTest("compiler/testData/codegen/bytecodeText/when/whenNull.kt");