Add support for llvm JIT engine

Packages describing “llvm” as local USE flag

Package “llvm” Flag Description
dev-db/postgresql Add support for llvm JIT engine
sci-libs/symengine Build with LLVM
dev-util/diffoscope Use sys-devel/llvm
dev-lang/ghc Pull in dependencies for the sys-devel/llvm codegen backend.
net-im/toxic Enables support for LLVM Address Sanitizer
media-libs/mesa Enable LLVM backend for Gallium3D.
sci-electronics/nvc Build LLVM code generator
sys-devel/sparse Build the sparse-llvm utility
dev-lang/zig Build with LLVM backend and extensions enabled.
sci-electronics/ghdl Build LLVM code generator

All packages providing a “llvm” USE flag (8)