[v3] fix new FAILs I caused on 4.6 branch

[Jonathan Wakely]

somehow I missed these fails when I backported the __promote changes
to the 4.6 branch:

        * testsuite/ext/type_traits/remove_unsigned_integer_neg.cc: Adjust
        dg-error line numbers.
        * testsuite/ext/type_traits/add_unsigned_floating_neg.cc: Likewise.
        * testsuite/ext/type_traits/remove_unsigned_floating_neg.cc: Likewise.
        * testsuite/ext/type_traits/add_unsigned_integer_neg.cc: Likewise.

Tested x86_64-linux, committed to 4.6.

Index: testsuite/ext/type_traits/remove_unsigned_integer_neg.cc
===================================================================
--- testsuite/ext/type_traits/remove_unsigned_integer_neg.cc    (revision 
182460)
+++ testsuite/ext/type_traits/remove_unsigned_integer_neg.cc    (working copy)
@@ -36,4 +36,4 @@ int main()
 }
 
 // { dg-error "invalid use of incomplete" "" { target *-*-* } 28 } 
-// { dg-error "declaration of" "" { target *-*-* } 106 }
+// { dg-error "declaration of" "" { target *-*-* } 107 }
Index: testsuite/ext/type_traits/add_unsigned_floating_neg.cc
===================================================================
--- testsuite/ext/type_traits/add_unsigned_floating_neg.cc      (revision 
182460)
+++ testsuite/ext/type_traits/add_unsigned_floating_neg.cc      (working copy)
@@ -35,4 +35,4 @@ int main()
 }
 
 // { dg-error "instantiated from" "" { target *-*-* } 28 } 
-// { dg-error "no type" "" { target *-*-* } 69 } 
+// { dg-error "no type" "" { target *-*-* } 70 } 
Index: testsuite/ext/type_traits/remove_unsigned_floating_neg.cc
===================================================================
--- testsuite/ext/type_traits/remove_unsigned_floating_neg.cc   (revision 
182460)
+++ testsuite/ext/type_traits/remove_unsigned_floating_neg.cc   (working copy)
@@ -35,4 +35,4 @@ int main()
 }
 
 // { dg-error "instantiated from" "" { target *-*-* } 28 }
-// { dg-error "no type" "" { target *-*-* } 112 }
+// { dg-error "no type" "" { target *-*-* } 113 }
Index: testsuite/ext/type_traits/add_unsigned_integer_neg.cc
===================================================================
--- testsuite/ext/type_traits/add_unsigned_integer_neg.cc       (revision 
182460)
+++ testsuite/ext/type_traits/add_unsigned_integer_neg.cc       (working copy)
@@ -36,4 +36,4 @@ int main()
 }
 
 // { dg-error "invalid use of incomplete" "" { target *-*-* } 28 } 
-// { dg-error "declaration of" "" { target *-*-* } 63 }
+// { dg-error "declaration of" "" { target *-*-* } 64 }