[X87][test]: Fixing -Wsign-compare compilation error for x87 test case.

test/cctest/test-run-wasm-relocation-x87.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdlib.h>
 
 #include "src/v8.h"
 
 #include "src/debug/debug.h"
 #include "src/disasm.h"
@@ skipping 38 matching lines @@
   CHECK_EQ(ret_value, imm);
 
 #ifdef OBJECT_PRINT
   OFStream os(stdout);
   code->Print(os);
   byte* begin = code->instruction_start();
   byte* end = begin + code->instruction_size();
   disasm::Disassembler::Disassemble(stdout, begin, end);
 #endif
 
-  size_t offset = 1234;
+  int offset = 1234;
 
   // Relocating references by offset
   int mode_mask = (1 << RelocInfo::WASM_MEMORY_REFERENCE);
   for (RelocIterator it(*code, mode_mask); !it.done(); it.next()) {
     RelocInfo::Mode mode = it.rinfo()->rmode();
     if (RelocInfo::IsWasmMemoryReference(mode)) {
       // Dummy values of size used here as the objective of the test is to
       // verify that the immediate is patched correctly
       it.rinfo()->update_wasm_memory_reference(
           it.rinfo()->wasm_memory_reference(),
@@ skipping 37 matching lines @@
 
   CSignature0<int32_t> csig;
   CodeDesc desc;
   assm.GetCode(&desc);
   Handle<Code> code = isolate->factory()->NewCode(
       desc, Code::ComputeFlags(Code::STUB), Handle<Code>());
   USE(code);
 
   CodeRunner<int32_t> runnable(isolate, code, &csig);
   int32_t ret_value = runnable.Call();
-  CHECK_NE(ret_value, 0xdeadbeef);
+  CHECK_NE(ret_value, bit_cast<int32_t>(0xdeadbeef));
 
 #ifdef OBJECT_PRINT
   OFStream os(stdout);
   code->Print(os);
   byte* begin = code->instruction_start();
   byte* end = begin + code->instruction_size();
   disasm::Disassembler::Disassemble(stdout, begin, end);
 #endif
 
   size_t offset = 10;
 
   int mode_mask = (1 << RelocInfo::WASM_MEMORY_SIZE_REFERENCE);
   for (RelocIterator it(*code, mode_mask); !it.done(); it.next()) {
     RelocInfo::Mode mode = it.rinfo()->rmode();
     if (RelocInfo::IsWasmMemorySizeReference(mode)) {
       it.rinfo()->update_wasm_memory_reference(
           reinterpret_cast<Address>(1234), reinterpret_cast<Address>(1234),
           it.rinfo()->wasm_memory_size_reference(),
           it.rinfo()->wasm_memory_size_reference() + offset, SKIP_ICACHE_FLUSH);
     }
   }
 
   ret_value = runnable.Call();
-  CHECK_NE(ret_value, 0xdeadbeef);
+  CHECK_NE(ret_value, bit_cast<int32_t>(0xdeadbeef));
 
 #ifdef OBJECT_PRINT
   code->Print(os);
   begin = code->instruction_start();
   end = begin + code->instruction_size();
   disasm::Disassembler::Disassemble(stdout, begin, end);
 #endif
 }
 #undef __