Adding --target= and --trace_registers flags.

--target=[xex|iso] makes it possible to specify the thing to run from a
flagfile.

src/xenia/cpu/cpu.cc

@@ -13,6 +13,8 @@
 // Tracing:
 DEFINE_bool(trace_instructions, false,
     "Trace all instructions.");
+DEFINE_bool(trace_registers, false,
+    "Trace register values when tracing instructions.");
 DEFINE_bool(trace_branches, false,
     "Trace all branches.");
 DEFINE_bool(trace_user_calls, false,
@@ -34,10 +36,3 @@ DEFINE_bool(dump_module_bitcode, true,
     "Writes the module bitcode both before and after optimizations.");
 DEFINE_bool(dump_module_map, true,
     "Dumps the module symbol database.");
-
-
-// Optimizations:
-DEFINE_bool(optimize_ir_modules, true,
-    "Whether to run LLVM optimizations on modules.");
-DEFINE_bool(optimize_ir_functions, true,
-    "Whether to run LLVM optimizations on functions.");