Add test for Trac 877

testsuite/tests/ghc-regress/th/TH_spliceD2.hs

+module TH_spliceD2 where
+
+import qualified TH_spliceD2_Lib
+
+$( [d| data T = T TH_spliceD2_Lib.T |] )

testsuite/tests/ghc-regress/th/TH_spliceD2_Lib.hs

+module TH_spliceD2_Lib where
+
+data T = T Int

testsuite/tests/ghc-regress/th/all.T

@@ -24,6 +24,10 @@ clean(['TH_spliceE5_Lib.hi', 'TH_spliceE5_Lib.o'])
 test('TH_spliceD1', normal, multimod_compile_fail, ['TH_spliceD1', '-v0'])
 clean(['TH_spliceD1_Lib.hi', 'TH_spliceD1_Lib.o'])
 
+test('TH_spliceD2', normal, multimod_compile, ['TH_spliceD2', '-v0'])
+clean(['TH_spliceD2_Lib.hi', 'TH_spliceD2_Lib.o'])
+
+
 # Testing profiling with TH is a bit tricky; we've already disabled
 # the prof way above, and also we want to add options specifically for
 # profiling (-osof p_o) because this is necessary when mixing