JVM_IR: fix primitive comparison optimizations

1. the `primitive == object?.something` fusion should not apply to
    `primitive.equals(object?.something)` because it can't;

 2. coercions to Int are there for a reason - don't remove them;

 3. better optimize `primitive == object?.something` -- the result
    should be subject to if-null fusion, so it needs to have a specific
    pattern that resembles safe calls.

 #KT-47597 Fixed

compiler/testData/codegen/bytecodeText/intrinsicsCompare/byteSmartCast_after.kt

@@ -1,5 +1,4 @@
 // !LANGUAGE: +ProperIeee754Comparisons
-// IGNORE_BACKEND_FIR: JVM_IR
 fun equals3(a: Byte?, b: Byte?) = a != null && b != null && a == b
 
 fun equals4(a: Byte?, b: Byte?) = if (a is Byte && b is Byte) a == b else null!!
@@ -21,10 +20,9 @@ fun less5(a: Any?, b: Any?) = if (a is Byte && b is Byte) a < b else true
 // 3 IF_ICMPGE
 
 // JVM_IR_TEMPLATES
-// 2 Intrinsics\.areEqual
+// 0 Intrinsics\.areEqual
 // 0 Intrinsics\.compare
-// 4 INVOKEVIRTUAL java/lang/Byte\.byteValue \(\)B
+// 8 INVOKEVIRTUAL java/lang/Byte\.byteValue \(\)B
 // 4 INVOKEVIRTUAL java/lang/Number\.byteValue \(\)B
 // 0 IFGE
 // 3 IF_ICMPGE
-

compiler/testData/codegen/bytecodeText/intrinsicsCompare/byteSmartCast_before.kt

@@ -1,6 +1,4 @@
 // !LANGUAGE: -ProperIeee754Comparisons
-// IGNORE_BACKEND_FIR: JVM_IR
-
 fun equals3(a: Byte?, b: Byte?) = a != null && b != null && a == b
 
 fun equals4(a: Byte?, b: Byte?) = if (a is Byte && b is Byte) a == b else null!!
@@ -21,9 +19,9 @@ fun less5(a: Any?, b: Any?) = if (a is Byte && b is Byte) a < b else true
 // 0 IF_ICMPGE
 
 // JVM_IR_TEMPLATES
-// 2 Intrinsics\.areEqual
+// 0 Intrinsics\.areEqual
 // 0 Intrinsics\.compare
-// 4 INVOKEVIRTUAL java/lang/Byte\.byteValue \(\)B
+// 8 INVOKEVIRTUAL java/lang/Byte\.byteValue \(\)B
 // 4 INVOKEVIRTUAL java/lang/Number\.byteValue \(\)B
 // 0 IFGE
-// 3 IF_ICMPGE
+// 3 IF_ICMPGE