[clang-tools-extra] In compilation databases, add support for relative directories (PR #69856)

[via cfe-commits]

github-actions[bot] wrote:


<!--LLVM CODE FORMAT COMMENT: {clang-format}-->

:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

<details>
<summary>
You can test this locally with the following command:
</summary>

``````````bash
git-clang-format --diff f3ff0a67be46f2380ca597d21fe551cf2bbf41fd 01c1271b9e0f9583262bf00d5853ef362764909a -- clang-tools-extra/clangd/GlobalCompilationDatabase.cpp clang/include/clang/Tooling/JSONCompilationDatabase.h clang/lib/Tooling/JSONCompilationDatabase.cpp clang/unittests/Tooling/CompilationDatabaseTest.cpp
``````````

</details>

<details>
<summary>
View the diff from clang-format here.
</summary>

``````````diff
diff --git a/clang/unittests/Tooling/CompilationDatabaseTest.cpp b/clang/unittests/Tooling/CompilationDatabaseTest.cpp
index 86bbe74bfdc4..9479d02532de 100644
--- a/clang/unittests/Tooling/CompilationDatabaseTest.cpp
+++ b/clang/unittests/Tooling/CompilationDatabaseTest.cpp
@@ -27,8 +27,8 @@ using testing::UnorderedElementsAreArray;
 static void expectFailure(StringRef JSONDatabase, StringRef Explanation) {
   std::string ErrorMessage;
   EXPECT_EQ(nullptr,
-            JSONCompilationDatabase::loadFromBuffer("", JSONDatabase, ErrorMessage,
-                                                    JSONCommandLineSyntax::Gnu))
+            JSONCompilationDatabase::loadFromBuffer(
+                "", JSONDatabase, ErrorMessage, JSONCommandLineSyntax::Gnu))
       << "Expected an error because of: " << Explanation.str();
 }
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/69856