* gnu/packages/llvm-meta.scm (clang-compiler-cpu-architectures): Add
entry for x86_64 for clang-18 for new optimization architectures.
Change-Id: I6301c28b5032caf520aa974c70c500e12d088e63
* gnu/packages/llvm-meta.scm (clang-compiler-cpu-architectures): Remove
x86_64 version 15 entry since it is unchanged from the version 13 entry.
Change-Id: Ifb845993e2deec842dfbe8f9b72944457aa7e98e