Remove support for pretenuring as it is not fully implemented and is currently turned on for a very…

runtime/vm/stub_code_x64.cc

Index: runtime/vm/stub_code_x64.cc
diff --git a/runtime/vm/stub_code_x64.cc b/runtime/vm/stub_code_x64.cc
index d66c1254bc9868da34ed2e28aa75ca95f71e6096..85ba27e71b0d4262085d3dce4635c61502ffa268 100644
--- a/runtime/vm/stub_code_x64.cc
+++ b/runtime/vm/stub_code_x64.cc
@@ -598,7 +598,7 @@ void StubCode::GenerateAllocateArrayStub(Assembler* assembler) {
   __ andq(RDI, Immediate(-kObjectAlignment));
 
   const intptr_t cid = kArrayCid;
-  Heap::Space space = Heap::SpaceForAllocation(cid);
+  Heap::Space space = Heap::kNew;
   __ movq(R13, Address(THR, Thread::heap_offset()));
   __ movq(RAX, Address(R13, Heap::TopOffset(space)));
 
@@ -850,7 +850,7 @@ void StubCode::GenerateAllocateContextStub(Assembler* assembler) {
     // Now allocate the object.
     // R10: number of context variables.
     const intptr_t cid = kContextCid;
-    Heap::Space space = Heap::SpaceForAllocation(cid);
+    Heap::Space space = Heap::kNew;
     __ movq(RCX, Address(THR, Thread::heap_offset()));
     __ movq(RAX, Address(RCX, Heap::TopOffset(space)));
     __ addq(R13, RAX);
@@ -1053,7 +1053,7 @@ void StubCode::GenerateAllocationStubForClass(Assembler* assembler,
     // Allocate the object and update top to point to
     // next object start and initialize the allocated object.
     // RDX: instantiated type arguments (if is_cls_parameterized).
-    Heap::Space space = Heap::SpaceForAllocation(cls.id());
+    Heap::Space space = Heap::kNew;
     __ movq(RCX, Address(THR, Thread::heap_offset()));
     __ movq(RAX, Address(RCX, Heap::TopOffset(space)));
     __ leaq(RBX, Address(RAX, instance_size));