VM: More abstract interface for generating stub calls.

runtime/vm/assembler_arm64.h

Index: runtime/vm/assembler_arm64.h
diff --git a/runtime/vm/assembler_arm64.h b/runtime/vm/assembler_arm64.h
index 701e7c44adb54bfc198aff0d2c8c70b06b80bec1..936e1050f01c673ab2997126fed87f1c3ce79444 100644
--- a/runtime/vm/assembler_arm64.h
+++ b/runtime/vm/assembler_arm64.h
@@ -21,6 +21,7 @@ namespace dart {
 
 // Forward declarations.
 class RuntimeEntry;
+class StubEntry;
 
 class Immediate : public ValueObject {
  public:
@@ -1203,6 +1204,8 @@ class Assembler : public ValueObject {
     br(TMP);
   }
 
+  void Branch(const StubEntry& stub_entry);
+
   // Fixed length branch to label.
   void BranchPatchable(const ExternalLabel* label) {
     // TODO(zra): Use LoadExternalLabelFixed if possible.
@@ -1210,11 +1213,15 @@ class Assembler : public ValueObject {
     br(TMP);
   }
 
+  void BranchPatchable(const StubEntry& stub_entry);
+
   void BranchLink(const ExternalLabel* label) {
     LoadExternalLabel(TMP, label);
     blr(TMP);
   }
 
+  void BranchLink(const StubEntry& stub_entry);
+
   // BranchLinkPatchable must be a fixed-length sequence so we can patch it
   // with the debugger.
   void BranchLinkPatchable(const ExternalLabel* label) {
@@ -1222,6 +1229,8 @@ class Assembler : public ValueObject {
     blr(TMP);
   }
 
+  void BranchLinkPatchable(const StubEntry& stub_entry);
+
   // Macros accepting a pp Register argument may attempt to load values from
   // the object pool when possible. Unless you are sure that the untagged object
   // pool pointer is in another register, or that it is not available at all,