[mips] Fix mips build

Change-Id: Ib93296a5d79b0e02eb3c283d8a605c9ab4e8c38a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2993879Reviewed-by: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Auto-Submit: Liu yu <liuyu@loongson.cn>
Cr-Commit-Position: refs/heads/master@{#75430}

src/codegen/mips/assembler-mips.cc

@@ -3570,7 +3570,8 @@ void Assembler::GrowBuffer() {
                                reloc_info_writer.last_pc() + pc_delta);
 
   // Relocate runtime entries.
-  base::Vector<byte> instructions{buffer_start_, pc_offset()};
+  base::Vector<byte> instructions{buffer_start_,
+                                  static_cast<size_t>(pc_offset())};
   base::Vector<const byte> reloc_info{reloc_info_writer.pos(), reloc_size};
   for (RelocIterator it(instructions, reloc_info, 0); !it.done(); it.next()) {
     RelocInfo::Mode rmode = it.rinfo()->rmode();

src/codegen/mips64/assembler-mips64.cc

@@ -3769,7 +3769,8 @@ void Assembler::GrowBuffer() {
                                reloc_info_writer.last_pc() + pc_delta);
 
   // Relocate runtime entries.
-  base::Vector<byte> instructions{buffer_start_, pc_offset()};
+  base::Vector<byte> instructions{buffer_start_,
+                                  static_cast<size_t>(pc_offset())};
   base::Vector<const byte> reloc_info{reloc_info_writer.pos(), reloc_size};
   for (RelocIterator it(instructions, reloc_info, 0); !it.done(); it.next()) {
     RelocInfo::Mode rmode = it.rinfo()->rmode();