[mlir] Fix mlir-pdll-lsp-server link. (#220123)
This is the same fix TableGenLspServerLib got in 9e469ced42cd. This
addresses the mlir-pdll-lsp-server instance of #152371.
MLIRPdllLspServerLib transitively needs LLVMTableGen, which is not part
of libLLVM.so, so MLIRPDLLParser already brings in static LLVMSupport.
Linking the dylib here as well gives mlir-pdll-lsp-server two copies of
LLVMSupport. Linking still succeeds, but with assertions
view-output.test fails. The test trips over the two copies having
different Hashing.h seeds, which is a separate defect to be addressed in
another PR.
It has not shown up in CI because it needs the dylib and assertions at
the same time, which rarely coincide. It also only became reachable once
a3a25996b114 moved the LSP transport into libLLVM.so.
Assisted-By: Claude Opus 5
