cppgc: fix sourceLocation test on gcc

This test produces different outputs when compiled with
gcc. It is currently failing on PPC using gcc-8, it also has
failed on riscv: https://github.com/riscv/v8/issues/174

I have also tested it with gcc-10 on x64 and it still fails.
The line numbers seem to be different when compiled with gcc
instead of clang.

As a workaround we can force the usage of macros in one line
to assure outputs are the same on either compiler.

Change-Id: I36a05d0dc62dfe66bdfcf177422836cb231284b2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2844666Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#74162}

test/unittests/heap/cppgc/logging-unittest.cc

@@ -63,13 +63,11 @@ TEST(LoggingTest, Message) {
 TEST(LoggingTest, SourceLocation) {
   using ::testing::AllOf;
   using ::testing::HasSubstr;
+  // clang-format off
   constexpr auto loc = SourceLocation::Current();
-  EXPECT_DEATH_IF_SUPPORTED(CPPGC_DCHECK(false),
-                            AllOf(HasSubstr(loc.FileName()),
-                                  HasSubstr(std::to_string(loc.Line() + 3))));
-  EXPECT_DEATH_IF_SUPPORTED(CPPGC_CHECK(false),
-                            AllOf(HasSubstr(loc.FileName()),
-                                  HasSubstr(std::to_string(loc.Line() + 6))));
+  EXPECT_DEATH_IF_SUPPORTED(CPPGC_DCHECK(false), AllOf(HasSubstr(loc.FileName()), HasSubstr(std::to_string(loc.Line() + 1)))); // NOLINT(whitespace/line_length)
+  EXPECT_DEATH_IF_SUPPORTED(CPPGC_CHECK(false), AllOf(HasSubstr(loc.FileName()), HasSubstr(std::to_string(loc.Line() + 2)))); // NOLINT(whitespace/line_length)
+  // clang-format on
 }
 #endif  // CPPGC_SUPPORTS_SOURCE_LOCATION