If the user rebinds the output locations and relinks a program, the
wrong program may be loaded from the cache.

TEST=gl_tests: TranslatorVariants/EXTBlendFuncExtended*

BUG=angleproject:4535

Change-Id: If9a9c2ad935ea4d01c3fe4313810d221e9c9ce38
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2131252
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>