This reverts commit c576e93d17.
Reason for revert: ASAN failures
Original change's description:
> Switch to the new SkSL lexer.
>
> This completely replaces flex with a new in-house lexical analyzer generator,
> which we have done for performance and memory usage reasons. Flex requires us
> to copy strings every time we need the text of a token, whereas this new lexer
> allows us to handle strings as a (non-null-terminated) pointer and length
> everywhere, eliminating most string copies.
>
> Bug: skia:
> Change-Id: I2add26efc9e20cb699520e82abcf713af3968aca
> Reviewed-on: https://skia-review.googlesource.com/39780
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
TBR=bsalomon@google.com,ethannicholas@google.com
Change-Id: If27b750a5f696d06a6bcffed12fe9f0598e084a6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/44881
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
358515491a