A64: Move veneer emission checking in the Assembler.

src/a64/macro-assembler-a64-inl.h

Index: src/a64/macro-assembler-a64-inl.h
diff --git a/src/a64/macro-assembler-a64-inl.h b/src/a64/macro-assembler-a64-inl.h
index 590ba8c734a7fac5f37e9b3fbada880f7cfb9792..9c7eb9f36cfe1a3fa5ef04223040622d7a9616cc 100644
--- a/src/a64/macro-assembler-a64-inl.h
+++ b/src/a64/macro-assembler-a64-inl.h
@@ -346,7 +346,7 @@ void MacroAssembler::Asr(const Register& rd,
 
 void MacroAssembler::B(Label* label) {
   b(label);
-  CheckVeneers(false);
+  CheckVeneerPool(false, false);
 }
 
 
@@ -1014,7 +1014,7 @@ void MacroAssembler::Ret(const Register& xn) {
   ASSERT(allow_macro_instructions_);
   ASSERT(!xn.IsZero());
   ret(xn);
-  CheckVeneers(false);
+  CheckVeneerPool(false, false);
 }