This caused `TestTreeEncodeDecode` to fail, and would make the reparsing of a coverage file incorrect.

Bug: b/152192800
Change-Id: Ic9f4c49c58350509f74755fec20f22b6c1213877
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/43569Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Tested-by: Ben Clayton <bclayton@google.com>