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/ir/irText/js/dynamic/dynamicArrayIncrementDecrement.kt

@@ -1,4 +1,6 @@
 // TARGET_BACKEND: JS_IR
+// KT-65195
+// IGNORE_BACKEND_K2: JS_IR
 
 fun testArrayIncrementDecrement(d: dynamic) {
     val t1 = ++d["prefixIncr"]

compiler/testData/ir/irText/js/dynamic/dynamicMemberIncrementDecrement.fir.ir.txt

@@ -31,7 +31,7 @@ FILE fqName:<root> fileName:/dynamicMemberIncrementDecrement.kt
               then: CONST Null type=kotlin.Nothing? value=null
             BRANCH
               if: CONST Boolean type=kotlin.Boolean value=true
-              then: BLOCK type=dynamic origin=null
+              then: BLOCK type=dynamic origin=PREFIX_INCR
                 VAR IR_TEMPORARY_VARIABLE name:tmp_1 type:dynamic [val]
                   GET_VAR 'val tmp_0: dynamic declared in <root>.testSafeMemberIncrementDecrement' type=dynamic origin=null
                 DYN_OP operator=EQ type=kotlin.Unit
@@ -54,7 +54,7 @@ FILE fqName:<root> fileName:/dynamicMemberIncrementDecrement.kt
               then: CONST Null type=kotlin.Nothing? value=null
             BRANCH
               if: CONST Boolean type=kotlin.Boolean value=true
-              then: BLOCK type=dynamic origin=null
+              then: BLOCK type=dynamic origin=PREFIX_DECR
                 VAR IR_TEMPORARY_VARIABLE name:tmp_3 type:dynamic [val]
                   GET_VAR 'val tmp_2: dynamic declared in <root>.testSafeMemberIncrementDecrement' type=dynamic origin=null
                 DYN_OP operator=EQ type=kotlin.Unit