Remove redundant source position information in RelocInfo

src/x64/assembler-x64.cc

Index: src/x64/assembler-x64.cc
diff --git a/src/x64/assembler-x64.cc b/src/x64/assembler-x64.cc
index 355996458cf70a163fc919f9cd7575e48e56ace1..8f86df7379bc9d4c3b9800138132fa6d2dfc83a4 100644
--- a/src/x64/assembler-x64.cc
+++ b/src/x64/assembler-x64.cc
@@ -325,6 +325,7 @@ Assembler::Assembler(Isolate* isolate, void* buffer, int buffer_size)
 void Assembler::GetCode(CodeDesc* desc) {
   // Finalize code (at this point overflow() may be true, but the gap ensures
   // that we are still not overlapping instructions and relocation info).
+  reloc_info_writer.Finish();
   DCHECK(pc_ <= reloc_info_writer.pos());  // No overlap.
   // Set up code descriptor.
   desc->buffer = buffer_;