Set correct IR origins for inc/dec operations

NB: in order to produce correct IR origins, the source element kinds for
some FIR elements has been changed. As a side effect, mapping PSI to FIR
slightly changed: namely, for `a[b]++`, `a[b]` used to be mapped on
`set` call or callable reference, but now it is mapped on `get` call.

^KT-61891: Fixed
^KT-64387: Fixed

compiler/testData/diagnostics/tests/operatorsOverloading/InconsistentGetSet.fir.kt

@@ -38,8 +38,8 @@ fun testMismatchingArities() {
     <!NO_VALUE_FOR_PARAMETER!>MismatchingArities1[0]++<!>
     MismatchingArities1[0] <!UNRESOLVED_REFERENCE!>+=<!> 1
 
-    <!NO_VALUE_FOR_PARAMETER!>++MismatchingArities2[0]<!>
-    <!NO_VALUE_FOR_PARAMETER!>MismatchingArities2[0]++<!>
+    ++<!NO_VALUE_FOR_PARAMETER!>MismatchingArities2[0]<!>
+    <!NO_VALUE_FOR_PARAMETER!>MismatchingArities2[0]<!>++
     <!NO_VALUE_FOR_PARAMETER!>MismatchingArities2[0]<!> += 1
 }