improvements to get code size down for programs that don't use GC

todo.txt

@@ -2,7 +2,6 @@ High priority (version 0.8.12)
 ==============================
 * test threads on windows; thread analysis needs to be even more restrictive!
 * implement message passing built-ins: channels/queues
-* outOfMem hook; 0 over-head for hello world program :-)
 * bug: {:}.toTable[int, string]()
 
 
@@ -20,18 +19,6 @@ version 0.9.0
 - fix overloading resolution
 - make ^ available as operator
 - implement closures; implement proper coroutines
-- rethink comment syntax; people want::
-
-  type
-    TConfig* = object
-      limit*: int
-      outFile*: string
-      # Regex patterns to ignore. TLogEntry field -> regex pattern
-      # If this matches, the request will NOT be shown.
-      ignoreRe*: TTable[string, string] 
-
-  I think a good compromise is to define positions for the docgen in the
-  grammar and ignore other comments everywhere.
 
 Bugs
 ----
@@ -45,8 +32,7 @@ version 0.9.XX
 ==============
 
 - distinct types for array/seq indexes
-- GC: marker procs for native Nimrod GC and Boehm GC
-- code concerning 'assert' is wasteful and unnecessarily complex
+- GC: marker procs for native Nimrod GC and Boehm GC; precise stack marking
 - implicit ref/ptr->var conversion; the compiler may store an object
   implicitly on the heap for write barrier efficiency
 - resizing of strings/sequences could take into account the memory that