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gallivm: LLVM-15 opaque pointers fixes

Closed Mihai Preda requested to merge preda/mesa:+ptr3 into main

LLVM-15 enables opaque pointers while still supporting legacy typed pointers; but we need to migrate our code to opaque pointers before LLVM-16 arrives.

The changes are mainly along these lines:

  • use LLVMBuildGEP2 and LLVMBuildLoad2 instead of the deprecated LLVMBuildGEP, LLVMBuildLoad. For this we need to know the deref-type of the pointer.
  • don't query the "element type" of a pointer type.
Edited by Mihai Preda