[compiler-rt] [compiler-rt] Fix misspelled variable name in GPU caches (PR #202604)

[Joseph Huber via llvm-commits]

jhuber6 wrote:

> doesn't stuff like this need a warning in case someone used them?

Why would it? It's a typo, there is no variable by that name

https://github.com/llvm/llvm-project/pull/202604