_d_allocclass -> "_d_newclass".

The define is a leftover from the times when we supported
both D1 and D2.

gen/passes/SimplifyDRuntimeCalls.cpp

@@ -363,7 +363,7 @@ void SimplifyDRuntimeCalls::InitOptimizations() {
     Optimizations["_d_newarraymT"] = &Allocation;
     Optimizations["_d_newarraymiT"] = &Allocation;
     Optimizations["_d_newarraymvT"] = &Allocation;
-    Optimizations[_d_allocclass] = &Allocation;
+    Optimizations["_d_newclass"] = &Allocation;
 }