[svn r40] Cleaned up some of the array routines to use gep/load/store instead of memcpy/memset.

Resizing arrays did not allocate enough memory for types bigger than 1 byte.

test/arrays4.d

@@ -0,0 +1,7 @@
+module arrays4;
+
+void main()
+{
+    auto arr = new int[4];
+    {auto arrcat = arr ~ arr;}
+}