A64: Force emission of the veneer pool emission when required.

src/a64/assembler-a64.h

Index: src/a64/assembler-a64.h
diff --git a/src/a64/assembler-a64.h b/src/a64/assembler-a64.h
index 31d7f17e071612e503c8fbfba88fdf27f1a5b018..47f9694e054c3b7ed5bef92205fa7f87e41b4a66 100644
--- a/src/a64/assembler-a64.h
+++ b/src/a64/assembler-a64.h
@@ -1808,10 +1808,13 @@ class Assembler : public AssemblerBase {
   // Emits veneers for branches that are approaching their maximum range.
   // If need_protection is true, the veneers are protected by a branch jumping
   // over the code.
-  void EmitVeneers(bool need_protection, int margin = kVeneerDistanceMargin);
+  void EmitVeneers(bool force_emit, bool need_protection,
+                   int margin = kVeneerDistanceMargin);
   void EmitVeneersGuard() { EmitPoolGuard(); }
   // Checks whether veneers need to be emitted at this point.
-  void CheckVeneerPool(bool require_jump, int margin = kVeneerDistanceMargin);
+  // If force_emit is set, a veneer is generated for *all* unresolved branches.
+  void CheckVeneerPool(bool force_emit, bool require_jump,
+                       int margin = kVeneerDistanceMargin);
 
 
   class BlockPoolsScope {