CompilationDatabaseBuildSystem should account for working directory

[bkolb]

Swift version

swiftlang-6.1.0.101.24 clang-1700.0.4.22

Platform

macOS

Editor

VSCode

Description

I have configured sourcekit-lsp in VSCode to use compile-commands extracted from bazel.
Trying to resolve reverse references fails. The reason is that my path pointing to the global index is relative to the working directory. Once converted to an absolute path, it works.
The candidate could be here: https://github.com/swiftlang/sourcekit-lsp/blob/main/Sources/BuildSystemIntegration/CompilationDatabaseBuildSystem.swift#L91-L109

Steps to Reproduce

No response

Logging

No response

[ahoppen]

Synced to Apple’s issue tracker as rdar://141004197