testsuite: add test for #8831

Signed-off-by: Austin Seipp <austin@well-typed.com>

testsuite/tests/ghci/scripts/T8831.hs

+{-# LANGUAGE TemplateHaskell #-}
+module T8831 where
+foo = [| 3 |]

testsuite/tests/ghci/scripts/T8831.script

+:seti -XTemplateHaskell
+:load T8831.hs
+$foo
+

testsuite/tests/ghci/scripts/T8831.stdout

+3

testsuite/tests/ghci/scripts/all.T

@@ -168,4 +168,4 @@ test('T8674', normal, ghci_script, ['T8674.script'])
 test('T8696', normal, ghci_script, ['T8696.script'])
 test('T8776', normal, ghci_script, ['T8776.script'])
 test('ghci059', normal, ghci_script, ['ghci059.script'])
-
+test('T8831', normal, ghci_script, ['T8831.script'])