Bug 557706 - Allow LogControl printf method to be overridden (r=nnethercote)

if LogControl.printf is made a virtual method then consumers of nanojit can
more easily control how the output is managed.

--HG--
extra : convert_revision : 7fa9ad2e2d57661e4290df0b3902fd809f19d768

js/src/nanojit/nanojit.h

@@ -260,7 +260,7 @@ namespace nanojit {
     public:
         // All Nanojit and jstracer printing should be routed through
         // this function.
-        void printf( const char* format, ... ) PRINTF_CHECK(2,3);
+        virtual void printf( const char* format, ... ) PRINTF_CHECK(2,3);
 
         // An OR of LC_Bits values, indicating what should be output
         uint32_t lcbits;