testsuite: Don't use grep -q in unpack_sums_7

`grep -q` closes stdin as soon as it finds the pattern it is looking
for, resulting in #22484.

testsuite/tests/unboxedsums/Makefile

@@ -6,6 +6,6 @@ include $(TOP)/mk/test.mk
 
 unpack_sums_7:
 	$(RM) -f unpack_sums_7.o unpack_sums_7.hi
-	'$(TEST_HC)' $(TEST_HC_OPTS) -c unpack_sums_7.hs  -O -dsuppress-all -ddump-simpl | grep -q '\(# |_ #\)'
+	'$(TEST_HC)' $(TEST_HC_OPTS) -c unpack_sums_7.hs  -O -dsuppress-all -dsuppress-uniques -ddump-simpl | grep '\(# |_ #\)'
 	# This is a test to check for the presence of an unboxed sum in the core for a program using UNPACK
 	# on a sum type which is evidence that the field has been correctly unpacked.

testsuite/tests/unboxedsums/all.T

@@ -46,7 +46,7 @@ test('unpack_sums_3', normal, compile_and_run, ['-O'])
 test('unpack_sums_4', normal, compile_and_run, ['-O'])
 test('unpack_sums_5', normal, compile, ['-O'])
 test('unpack_sums_6', fragile(22504), compile_and_run, ['-O'])
-test('unpack_sums_7', [], makefile_test, [])
+test('unpack_sums_7', normal, makefile_test, [])
 test('unpack_sums_8', normal, compile_and_run, [""])
 test('unpack_sums_9', normal, compile, [""])
 

testsuite/tests/unboxedsums/unpack_sums_7.hs

--- NB: Compiling this module throws an exception involving Weak# at the end of compilation.
--- This is unrelated to unpacked sums but we need to include the error in the expected output for the test to pass.
-
 module UnpackedSums7 where
 
 data T = MkT {-# UNPACK #-} !MI

testsuite/tests/unboxedsums/unpack_sums_7.stderr

-Exception during Weak# finalization (ignored): <stdout>: hFlush: resource vanished (Broken pipe)
-Exception during Weak# finalization (ignored): <stdout>: hFlush: resource vanished (Broken pipe)

testsuite/tests/unboxedsums/unpack_sums_7.stdout

+             JI unbx -> (# |_ #) unbx
+t = MkT ((# |_ #) t1)