util,tests: Add Clang version 10 and 11 to the compiler tests
util,tests: Add Clang version 10 and 11 to the compiler tests

Change-Id: Iad14cc57dad54a9b36f6304f882e55077f5f0156
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/45683
Reviewed-by: Gabe Black <d3e8afea784ab4a50a2dbf9149d2eaa8478e1cbc@gmail.com>
Maintainer: Gabe Black <d3e8afea784ab4a50a2dbf9149d2eaa8478e1cbc@gmail.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

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