Remove two duplicate unittests from std.bitmanip;

std/bitmanip.d

@@ -277,6 +277,7 @@ of the bitfields storage.
     assert(obj.x == 2);
     assert(obj.y == 0);
     assert(obj.z == 2);
+    assert(obj.flag == false);
 }
 
 /**
@@ -294,6 +295,12 @@ one bitfield with an empty name.
             uint, "",         6));
     }
 
+    A a;
+    assert(a.flag1 == 0);
+    a.flag1 = 1;
+    assert(a.flag1 == 1);
+    a.flag1 = 0;
+    assert(a.flag1 == 0);
 }
 
 /// enums can be used too
@@ -309,51 +316,6 @@ one bitfield with an empty name.
     }
 }
 
-/**
-Creates a bitfield pack of eight bits, which fit in
-one `ubyte`. The bitfields are allocated starting from the
-least significant bit, i.e. x occupies the two least significant bits
-of the bitfields storage.
-*/
-@safe unittest
-{
-    struct A
-    {
-        int a;
-        mixin(bitfields!(
-            uint, "x",    2,
-            int,  "y",    3,
-            uint, "z",    2,
-            bool, "flag", 1));
-    }
-    A obj;
-    obj.x = 2;
-    obj.z = obj.x;
-
-    assert(obj.x == 2);
-    assert(obj.y == 0);
-    assert(obj.z == 2);
-    assert(obj.flag == false);
-}
-
-/// Add empty fields for padding to have a total bit length of 8, 16, 32, or 64
-@safe unittest
-{
-    struct A
-    {
-        mixin(bitfields!(
-            bool, "flag1",    1,
-            bool, "flag2",    1,
-            uint, "",         6));
-    }
-    A a;
-    assert(a.flag1 == 0);
-    a.flag1 = 1;
-    assert(a.flag1 == 1);
-    a.flag1 = 0;
-    assert(a.flag1 == 0);
-}
-
 /**
 This string mixin generator allows one to create tagged pointers inside $(D_PARAM struct)s and $(D_PARAM class)es.