[clang-tools-extra] Add clangd-index-server support for cross platform indexes (PR #207202)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang-tools-extra/clangd/index/remote/marshalling/Marshalling.cpp clang-tools-extra/clangd/index/remote/server/Server.cpp clang-tools-extra/clangd/unittests/remote/MarshallingTests.cpp --diff_from_common_commit
``````````

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The reproduction instructions above might return results for more than one PR
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changing `origin/main` to the base branch/commit you want to compare against.
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View the diff from clang-format here.
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``````````diff
diff --git a/clang-tools-extra/clangd/index/remote/server/Server.cpp b/clang-tools-extra/clangd/index/remote/server/Server.cpp
index f36025156..f24e21ef0 100644
--- a/clang-tools-extra/clangd/index/remote/server/Server.cpp
+++ b/clang-tools-extra/clangd/index/remote/server/Server.cpp
@@ -590,7 +590,8 @@ int main(int argc, char *argv[]) {
   llvm::sys::SetInterruptFunction(&clang::clangd::requestShutdown);
 
   if (!llvm::sys::path::is_absolute(IndexRoot, llvm::sys::path::Style::posix) &&
-      !llvm::sys::path::is_absolute(IndexRoot, llvm::sys::path::Style::windows)) {
+      !llvm::sys::path::is_absolute(IndexRoot,
+                                    llvm::sys::path::Style::windows)) {
     llvm::errs() << "Index root should be an absolute path.\n";
     return -1;
   }
diff --git a/clang-tools-extra/clangd/unittests/remote/MarshallingTests.cpp b/clang-tools-extra/clangd/unittests/remote/MarshallingTests.cpp
index b4f5c7d89..74eb60984 100644
--- a/clang-tools-extra/clangd/unittests/remote/MarshallingTests.cpp
+++ b/clang-tools-extra/clangd/unittests/remote/MarshallingTests.cpp
@@ -466,7 +466,7 @@ TEST(RemoteMarshallingTest, CrossPlatformPathsRoundTrip) {
   Location.End.setColumn(4);
   // Construct the URI as a Windows machine would have serialized it into the
   // index: file:///C:/remote/project/lib/File.cpp.
-  Location.FileURI = 
+  Location.FileURI =
       Strings.save("file:///C:/remote/project/lib/File.cpp").begin();
   Ref.Location = Location;
 

``````````

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https://github.com/llvm/llvm-project/pull/207202