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

runtime/vm/stub_code_arm64.cc

Index: runtime/vm/stub_code_arm64.cc
diff --git a/runtime/vm/stub_code_arm64.cc b/runtime/vm/stub_code_arm64.cc
index 97a20c80c3021e3bbec1e2c6a72bdd1e32fc52af..9cfe5fa57ceeb6d339b8bab25cd67864e6d2b56b 100644
--- a/runtime/vm/stub_code_arm64.cc
+++ b/runtime/vm/stub_code_arm64.cc
@@ -654,7 +654,7 @@ void StubCode::GenerateAllocateArrayStub(Assembler* assembler) {
   const intptr_t cid = kArrayCid;
   __ MaybeTraceAllocation(kArrayCid, R4, &slow_case);
 
-  Heap::Space space = Heap::SpaceForAllocation(cid);
+  Heap::Space space = Heap::kNew;
   __ LoadIsolate(R8);
   __ ldr(R8, Address(R8, Isolate::heap_offset()));
 
@@ -922,7 +922,7 @@ void StubCode::GenerateAllocateContextStub(Assembler* assembler) {
     // R1: number of context variables.
     // R2: object size.
     const intptr_t cid = kContextCid;
-    Heap::Space space = Heap::SpaceForAllocation(cid);
+    Heap::Space space = Heap::kNew;
     __ LoadIsolate(R5);
     __ ldr(R5, Address(R5, Isolate::heap_offset()));
     __ ldr(R0, Address(R5, Heap::TopOffset(space)));
@@ -1108,7 +1108,7 @@ void StubCode::GenerateAllocationStubForClass(Assembler* assembler,
     // Allocate the object and update top to point to
     // next object start and initialize the allocated object.
     // R1: instantiated type arguments (if is_cls_parameterized).
-    Heap::Space space = Heap::SpaceForAllocation(cls.id());
+    Heap::Space space = Heap::kNew;
     __ ldr(R5, Address(THR, Thread::heap_offset()));
     __ ldr(R2, Address(R5, Heap::TopOffset(space)));
     __ AddImmediate(R3, R2, instance_size);