[turbofan] Run everything after representation selection concurrently.

src/mips/interface-descriptors-mips.cc

Index: src/mips/interface-descriptors-mips.cc
diff --git a/src/mips/interface-descriptors-mips.cc b/src/mips/interface-descriptors-mips.cc
index d324295dd27c2714d398537f9324cc86088017dd..eb6e7e42412e4a92a544f44c899aa7a810b95c4d 100644
--- a/src/mips/interface-descriptors-mips.cc
+++ b/src/mips/interface-descriptors-mips.cc
@@ -246,13 +246,6 @@ void AllocateHeapNumberDescriptor::InitializePlatformSpecific(
 SIMD128_TYPES(SIMD128_ALLOC_DESC)
 #undef SIMD128_ALLOC_DESC
 
-void AllocateDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {a0};
-  data->InitializePlatformSpecific(arraysize(registers), registers);
-}
-
-
 void ArrayConstructorConstantArgCountDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   // register state