KT-15871 Unnecessary boxing for equality operator on inlined primitive values

Allow kotlin.jvm.internal.Intrinsics#areEqual for boxed values.
Rewrite to primitive equality.

NB we can't do that for Float and Double, because java.lang.Float#equals
and java.lang.Double#equals behave differently from primitive equality comparisons.

compiler/testData/codegen/box/ieee754/safeCall.kt

@@ -2,6 +2,9 @@
 fun box(): String {
     val plusZero: Double? = 0.0
     val minusZero: Double = -0.0
+
+    useBoxed(plusZero)
+
     if (plusZero?.equals(minusZero) ?: null!!) {
         return "fail 1"
     }
@@ -11,4 +14,6 @@ fun box(): String {
     }
 
     return "OK"
-}
+}
+
+fun useBoxed(a: Any?) {}