Use LLVM OStream wrapper instead of <iostream> in the logger. llvm::OStream provides all std::ostream functionality (by holding a std::ostream* internally), but * doesn't include <iostream>, avoiding per-file overhead. * allows the stream pointer to be null, and the (inlined) operators do nothing when that's the case. (This also allows removal of the ofstream("/dev/null") hack Logger used when disabled, which presumably wasn't very portable)

--- a/gen/llvmhelpers.cpp	Thu Feb 26 15:24:20 2009 +0100
+++ b/gen/llvmhelpers.cpp	Thu Feb 26 14:51:02 2009 +0100
@@ -546,7 +546,7 @@
     }
 
     // unknown
-    std::cout << "unsupported: null value for " << type->toChars() << '\n';
+    llvm::cout << "unsupported: null value for " << type->toChars() << '\n';
     assert(0);
     return 0;