S390: [turbofan] Run everything after representation selection concurrently.

src/s390/builtins-s390.cc

Index: src/s390/builtins-s390.cc
diff --git a/src/s390/builtins-s390.cc b/src/s390/builtins-s390.cc
index e02fd5b4d872f76b5b33c2aa13ee606e9c731b76..2d521db65e3fb6ef4dce1e0633884c4ff8c71a5c 100644
--- a/src/s390/builtins-s390.cc
+++ b/src/s390/builtins-s390.cc
@@ -2691,6 +2691,41 @@ void Builtins::Generate_Construct(MacroAssembler* masm) {
           RelocInfo::CODE_TARGET);
 }
 
+// static
+void Builtins::Generate_AllocateInNewSpace(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- r3 : requested object size (untagged)
+  //  -- lr : return address
+  // -----------------------------------
+  Label runtime;
+  __ Allocate(r3, r2, r4, r5, &runtime, NO_ALLOCATION_FLAGS);
+  __ Ret();
+
+  __ bind(&runtime);
+  __ SmiTag(r3);
+  __ Push(r3);
+  __ LoadSmiLiteral(cp, Smi::FromInt(0));
+  __ TailCallRuntime(Runtime::kAllocateInNewSpace);
+}
+
+// static
+void Builtins::Generate_AllocateInOldSpace(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- r3 : requested object size (untagged)
+  //  -- lr : return address
+  // -----------------------------------
+  Label runtime;
+  __ Allocate(r3, r2, r4, r5, &runtime, PRETENURE);
+  __ Ret();
+
+  __ bind(&runtime);
+  __ SmiTag(r3);
+  __ LoadSmiLiteral(r4, Smi::FromInt(AllocateTargetSpace::encode(OLD_SPACE)));
+  __ Push(r3, r4);
+  __ LoadSmiLiteral(cp, Smi::FromInt(0));
+  __ TailCallRuntime(Runtime::kAllocateInTargetSpace);
+}
+
 void Builtins::Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- r2 : actual number of arguments