make immutable map and immutable list exceptions consistent

[sigmundch]

Currently the vm throws different exceptions when attempting to update a const array vs a const map:

Code sample:
  1 main() {
  2 var a = const [1];
  3 var b = const {"a" : 1};
  4 try {
  5 a[0] = 1;
  6 } catch (var e) {
  7 print (e is UnsupportedOperationException);
  8 print (e is IllegalAccessException);
  9 }
 10 try {
 11 b["a"] = 1;
 12 } catch (var e) {
 13 print (e is UnsupportedOperationException);
 14 print (e is IllegalAccessException);
 15 }
 16 }

This prints:
true
false
false
true

Seems like they should both be IllegalAccessException.

[iposva-google]

Set owner to @sgmitrovic.
Added Accepted label.

[ghost]

The behavior is unspecified, i.e., it is OK to throw any exception. I am reluctant changing anything in the VM until a common behavior has been agreed upon. Punting it to library area.

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Removed the owner.
Removed Area-VM label.
Added Area-Library, Triaged labels.

[floitschG]

This has been fixed some time ago. Both now throw an UnsupportedError.

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Added Fixed label.