Fix a bunch of implicit casts detected by the Win64 compiler

src/assembler.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 345 matching lines @@
       WriteExtraTaggedIntData(pos_delta, pos_type_tag);
     }
     last_position_ = static_cast<int>(rinfo->data());
   } else if (RelocInfo::IsComment(rmode)) {
     // Comments are normally not generated, so we use the costly encoding.
     WriteExtraTaggedPC(pc_delta, kPCJumpExtraTag);
     WriteExtraTaggedData(rinfo->data(), kCommentTag);
     ASSERT(begin_pos - pos_ >= RelocInfo::kMinRelocCommentSize);
   } else if (RelocInfo::IsConstPool(rmode)) {
       WriteExtraTaggedPC(pc_delta, kPCJumpExtraTag);
-      WriteExtraTaggedConstPoolData(rinfo->data());
+      WriteExtraTaggedConstPoolData(static_cast<int>(rinfo->data()));
   } else {
     ASSERT(rmode > RelocInfo::LAST_COMPACT_ENUM);
     int saved_mode = rmode - RelocInfo::LAST_COMPACT_ENUM;
     // For all other modes we simply use the mode as the extra tag.
     // None of these modes need a data component.
     ASSERT(saved_mode < kPCJumpExtraTag && saved_mode < kDataJumpExtraTag);
     WriteExtraTaggedPC(pc_delta, saved_mode);
   }
   last_pc_ = rinfo->pc();
 #ifdef DEBUG
@@ skipping 989 matching lines @@
     assembler_->RecordRelocInfo(RelocInfo::POSITION, state_.current_position);
     state_.written_position = state_.current_position;
     written = true;
   }
 
   // Return whether something was written.
   return written;
 }
 
 } }  // namespace v8::internal