It holds a file path and line number.

Bug: b/145351270
Change-Id: I0f54d00bda151be529d912562061052abff2fe81
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/38896Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>