Public bug reported:

1. llvm 9 has been released, but mesa in the repo still uses llvm 8.
2. llvm 9 bitcode libs for OpenCL cause llvm-8-based mesa to fail because their 
file format has changed
3. There was a bug in llvm-8-based mesa in disco that caused the OpenCL 
compiler to hang on the kernels combining hyperbolic and circular functions. 
There were no hang after I have rebuilt mesa and dri against llvm-10.

** Affects: mesa (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1846053

Title:
  Use llvm 9 or even llvm-10

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