Implement first D-specific optimization pass: -simplify-drtcalls. It uses the machinery of the standard -simplify-libcalls pass, but optimizes calls to the D runtime instead of calls to C libraries. At the moment, these optimizations are implemented by this pass: - Avoid the runtime call for `arr.length = newlen` if it can determine that the new length isn't longer than the old one. - Ditto for `cast(T[]) arr` if it will clearly always succeed. (e.g. if the length of the original array is zero, or if the old element size is a multiple of the new element size)

--- a/CMakeLists.txt	Mon Apr 27 22:34:36 2009 +0200
+++ b/CMakeLists.txt	Tue Apr 28 21:58:06 2009 +0200
@@ -135,7 +135,7 @@
 
 file(GLOB FE_SRC ${DMDFE_PATH}/*.c)
 file(GLOB FE_SRC_ROOT ${DMDFE_PATH}/root/*.c)
-file(GLOB GEN_SRC gen/*.cpp)
+file(GLOB_RECURSE GEN_SRC gen/*.cpp)
 file(GLOB IR_SRC ir/*.cpp)
 # exclude idgen and impcnvgen and generated sources, just in case
 list(REMOVE_ITEM FE_SRC