Sema: allow cast builtins on vectors

The following cast builtins did not previously work on vectors, and have
been made to:

* `@floatCast`
* `@ptrFromInt`
* `@intFromPtr`
* `@floatFromInt`
* `@intFromFloat`
* `@intFromBool`

Resolves: #16267

src/AstGen.zig

@@ -8041,7 +8041,7 @@ fn builtinCall(
         .compile_error         => return simpleUnOp(gz, scope, ri, node, .{ .rl = .{ .ty = .slice_const_u8_type } }, params[0], .compile_error),
         .set_eval_branch_quota => return simpleUnOp(gz, scope, ri, node, .{ .rl = .{ .coerced_ty = .u32_type } },    params[0], .set_eval_branch_quota),
         .int_from_enum         => return simpleUnOp(gz, scope, ri, node, .{ .rl = .none },                           params[0], .int_from_enum),
-        .int_from_bool         => return simpleUnOp(gz, scope, ri, node, bool_ri,                                    params[0], .int_from_bool),
+        .int_from_bool         => return simpleUnOp(gz, scope, ri, node, .{ .rl = .none },                           params[0], .int_from_bool),
         .embed_file            => return simpleUnOp(gz, scope, ri, node, .{ .rl = .{ .ty = .slice_const_u8_type } }, params[0], .embed_file),
         .error_name            => return simpleUnOp(gz, scope, ri, node, .{ .rl = .{ .ty = .anyerror_type } },       params[0], .error_name),
         .set_runtime_safety    => return simpleUnOp(gz, scope, ri, node, bool_ri,                                    params[0], .set_runtime_safety),