[wasm] Fix -Wsign-compare warnings.

test/cctest/test-run-wasm-relocation-ia32.cc

Index: test/cctest/test-run-wasm-relocation-ia32.cc
diff --git a/test/cctest/test-run-wasm-relocation-ia32.cc b/test/cctest/test-run-wasm-relocation-ia32.cc
index e23d0977d69a434407d9be5860c69e826a07bafe..f2241d5f9263ddad332f3db1b1ec8135e1743cc0 100644
--- a/test/cctest/test-run-wasm-relocation-ia32.cc
+++ b/test/cctest/test-run-wasm-relocation-ia32.cc
@@ -56,7 +56,7 @@ TEST(WasmRelocationIa32MemoryReference) {
   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);
@@ -114,7 +114,7 @@ TEST(WasmRelocationIa32MemorySizeReference) {
 
   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);
@@ -138,7 +138,7 @@ TEST(WasmRelocationIa32MemorySizeReference) {
   }
 
   ret_value = runnable.Call();
-  CHECK_NE(ret_value, 0xdeadbeef);
+  CHECK_NE(ret_value, bit_cast<int32_t>(0xdeadbeef));
 
 #ifdef OBJECT_PRINT
   code->Print(os);