First two appearances of baseInstances should have type
GLuint instead of GLint. It should be a typo.

Bug: angleproject:4838
Change-Id: I3df0dd9deb90a18bb2527ba24fe2ddd2766dd7f0
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2298200Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Shrek Shao <shrekshao@google.com>