[hack] Don't turn the string literal "\X" into "\x"
[hack] Don't turn the string literal "\X" into "\x"

Summary: We were putting the wrong string back into the buffer during lowering.

Reviewed By: oulgen

Differential Revision: D13458111

fbshipit-source-id: d667890cab331731599e0f155ade1eaaf97c107d

nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow