Allow specific optimization passes to be requested from the command line. Now you can run "`ldc test.d -c -mem2reg -simplifycfg`" if you feel the urge. The -O<N> options are still supported, and are inserted in the passes list in the position where they appear on the command line. (so -simplifycfg -O1 -instcombine does the "right thing") One small change: -inline is renamed to -enable-inlining due to a naming conflict with the option to add the -inline pass. -inline now inserts the inlining pass in the position specified, not in the middle of -O<N>. (ldmd has been updated to translate -inline to -enable-inlining)

--- a/gen/main.cpp	Sun Mar 29 11:44:32 2009 +0200
+++ b/gen/main.cpp	Sun Mar 29 15:46:55 2009 +0200
@@ -192,8 +192,6 @@
     cl::SetVersionPrinter(&printVersion);
     cl::ParseCommandLineOptions(final_args.size(), (char**)&final_args[0], "LLVM-based D Compiler\n", true);
 
-    global.params.optimize = (global.params.optimizeLevel >= 0);
-
     // Negated options
     global.params.link = !compileOnly;
     global.params.obj = !dontWriteObj;