Add regression test for old panic on inlining undeclared identifier (#495)

testsuite/tests/rename/should_fail/T495.hs

+-- Regression test for #495
+
+-- inlining an undeclared identifier should give error, not panic...
+{-# INLINE blarg #-}
+
+-- even if the identifier is imported in the Prelude...
+{-# INLINE lookup #-}

testsuite/tests/rename/should_fail/T495.stderr

+
+T495.hs:4:12: error:
+    The INLINE pragma for ‘blarg’ lacks an accompanying binding
+
+T495.hs:7:12: error:
+    The INLINE pragma for ‘lookup’ lacks an accompanying binding
+      (The INLINE pragma must be given where ‘lookup’ is declared)

testsuite/tests/rename/should_fail/all.T

@@ -60,6 +60,7 @@ test('rnfail056', normal, compile_fail, [''])
 test('rnfail057', normal, compile_fail, [''])
 
 test('rn_dup', normal, compile_fail, [''])
+test('T495', normal, compile_fail, [''])
 test('T2490', normal, compile_fail, [''])
 test('T2901', normal, compile_fail, [''])
 test('T2723', normal, compile, [''])  # Warnings only