A64: clean up pending reloc info if code generation was aborted.

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 c4a02607caf95e442bd639c879812b78a4662a8b..3da4382b79aa8dfc9f028e6671e01c03e6bb3716 100644
--- a/src/a64/assembler-a64.h
+++ b/src/a64/assembler-a64.h
@@ -743,6 +743,10 @@ class Assembler : public AssemblerBase {
 
   virtual ~Assembler();
 
+  virtual void AbortedCodeGeneration() {
+    num_pending_reloc_info_ = 0;
+  }
+
   // System functions ---------------------------------------------------------
   // Start generating code from the beginning of the buffer, discarding any code
   // and data that has already been emitted into the buffer.