Fix tests with missing EXIT or SIGNAL tests

Some tests had previously been passing despite actually causing a crash, due
to the required output being too loosely specified. This ensures the bare minimum:
that every test has an expected EXIT code and SIGNAL result.

The codes suggested were taken from the test's current output, and only applied for
CORE tests, but hand inspection suggests these choices are reasonable.

Author: smowton

regression/ansi-c/Forward_Declaration2/test.desc

@@ -1,6 +1,7 @@
 CORE
 main.c
 
+^EXIT=(1|64)$
 ^SIGNAL=0$
 ^CONVERSION ERROR$
 --

regression/ansi-c/Incomplete_Type1/test.desc

@@ -1,6 +1,7 @@
 CORE
 main.c
 
+^EXIT=(1|64)$
 ^SIGNAL=0$
 ^CONVERSION ERROR$
 --

regression/ansi-c/function_return1/test.desc

@@ -2,6 +2,7 @@ CORE
 main.c
 --verbosity 2
 ^main.c:3:1: warning: function has return void but a return statement returning signed int$
+^EXIT=0$
 ^SIGNAL=0$
 --
 ^warning: ignoring

regression/ansi-c/static2/test.desc

@@ -2,5 +2,7 @@ CORE
 main.c
 main2.c --function foo
 ^main symbol `foo' is ambiguous$
+^EXIT=(1|64)$
+^SIGNAL=0$
 --
 ^warning: ignoring

regression/ansi-c/static3/test.desc

@@ -2,5 +2,7 @@ CORE
 main.c
 main2.c --function foo
 ^main symbol `foo' is ambiguous$
+^EXIT=(1|64)$
+^SIGNAL=0$
 --
 ^warning: ignoring

regression/cbmc-java/NondetArray/test.desc

@@ -2,5 +2,7 @@ CORE
 NondetArray.class
 --function NondetArray.main
 ^VERIFICATION SUCCESSFUL$
+^EXIT=0$
+^SIGNAL=0$
 --
 ^warning: ignoring

regression/cbmc-java/NondetArray2/test.desc

@@ -2,6 +2,8 @@ CORE
 NondetArray2.class
 --function NondetArray2.main --unwind 5
 ^VERIFICATION SUCCESSFUL$
+^EXIT=0$
+^SIGNAL=0$
 --
 --
 Disabled pending fixing warnings for array-of with zero length:

regression/cbmc-java/NondetArray3/test.desc

@@ -2,6 +2,8 @@ CORE
 NondetArray3.class
 --function NondetArray3.main --unwind 5
 ^VERIFICATION SUCCESSFUL$
+^EXIT=0$
+^SIGNAL=0$
 --
 --
 Disabled pending fixing warnings for array-of with zero length:

regression/cbmc-java/NondetArray4/test.desc

@@ -2,5 +2,7 @@ CORE
 NondetArray4.class
 --function NondetArray4.main
 ^VERIFICATION SUCCESSFUL$
+^EXIT=0$
+^SIGNAL=0$
 --
 ^warning: ignoring

regression/cbmc-java/NondetAssume1/test.desc

@@ -2,5 +2,7 @@ CORE
 NondetAssume1.class
 --function NondetAssume1.main
 ^VERIFICATION SUCCESSFUL$
+^EXIT=0$
+^SIGNAL=0$
 --
 ^warning: ignoring