Generate some intrinsics using our IR.

runtime/vm/assembler_arm64.cc

Index: runtime/vm/assembler_arm64.cc
===================================================================
--- runtime/vm/assembler_arm64.cc	(revision 39651)
+++ runtime/vm/assembler_arm64.cc	(working copy)
@@ -31,7 +31,8 @@
       patchable_pool_entries_(),
       prologue_offset_(-1),
       use_far_branches_(use_far_branches),
-      comments_() {
+      comments_(),
+      allow_constant_pool_(true) {
   if (Isolate::Current() != Dart::vm_isolate()) {
     object_pool_ = GrowableObjectArray::New(Heap::kOld);
 
@@ -488,6 +489,8 @@
 
 
 bool Assembler::CanLoadObjectFromPool(const Object& object) {
+  if (!allow_constant_pool()) return false;
+
   // TODO(zra, kmillikin): Also load other large immediates from the object
   // pool
   if (object.IsSmi()) {
@@ -508,6 +511,7 @@
 
 
 bool Assembler::CanLoadImmediateFromPool(int64_t imm, Register pp) {
+  if (!allow_constant_pool()) return false;
   return !Utils::IsInt(32, imm) &&
          (pp != kNoPP) &&
          // We *could* put constants in the pool in a VM isolate, but it is
@@ -567,7 +571,9 @@
 
 
 void Assembler::LoadDecodableImmediate(Register reg, int64_t imm, Register pp) {
-  if ((pp != kNoPP) && (Isolate::Current() != Dart::vm_isolate())) {
+  if ((pp != kNoPP) &&
+      (Isolate::Current() != Dart::vm_isolate()) &&
+      allow_constant_pool()) {
     int64_t val_smi_tag = imm & kSmiTagMask;
     imm &= ~kSmiTagMask;  // Mask off the tag bits.
     const int32_t offset = Array::element_offset(FindImmediate(imm));