[loong64] Fix an undefined behavior

negation of 'INT64_MIN' cannot be represented in type 'int64_t'.


Change-Id: Ieddb0fc9bae4d3c85485bb94e76c05c72529a978
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3402665Reviewed-by: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Cr-Commit-Position: refs/heads/main@{#78740}

test/cctest/test-macro-assembler-loong64.cc

@@ -508,7 +508,7 @@ static const std::vector<int64_t> ffint_ftintrz_int64_test_values() {
                                     static_cast<int64_t>(0xFFFFFFFFFFFFFFFF)};
   return std::vector<int64_t>(&kValues[0], &kValues[arraysize(kValues)]);
 }
-  // clang-off on
+// clang-format on
 
 // Helper macros that can be used in FOR_INT32_INPUTS(i) { ... *i ... }
 #define FOR_INPUTS(ctype, itype, var, test_vector)           \
@@ -616,7 +616,7 @@ TEST(Ffint_d_l_Ftintrz_l_ud) {
   CcTest::InitializeVM();
   FOR_INT64_INPUTS(i, ffint_ftintrz_int64_test_values) {
     int64_t input = *i;
-    uint64_t abs_input = (input < 0) ? -input : input;
+    uint64_t abs_input = (input >= 0 || input == INT64_MIN) ? input : -input;
     auto fn = [](MacroAssembler* masm) {
       __ movgr2fr_d(f8, a0);
       __ ffint_d_l(f10, f8);