fix: Start RC at 1 again

compiler/noirc_evaluator/src/ssa/ssa_gen/mod.rs

@@ -703,9 +703,7 @@ impl<'a> FunctionContext<'a> {
         // Don't mutate the reference count if we're assigning an array literal to a Let:
         // `let mut foo = [1, 2, 3];`
         // we consider the array to be moved, so we should have an initial rc of just 1.
-        //
-        // TODO: this exception breaks #6763
-        let should_inc_rc = true; // !let_expr.expression.is_array_or_slice_literal();
+        let should_inc_rc = !let_expr.expression.is_array_or_slice_literal();
 
         values = values.map(|value| {
             let value = value.eval(self);

test_programs/execution_success/reference_counts/src/main.nr

@@ -2,7 +2,7 @@ use std::mem::array_refcount;
 
 fn main() {
     let mut array = [0, 1, 2];
-    assert_refcount(array, 2);
+    assert_refcount(array, 1);
 
     borrow(array, array_refcount(array));
     borrow_mut(&mut array, array_refcount(array));