[mlir][LLVMIR] Allow address-of-global as a leaf in array constants (#198424) Large `llvm.mlir.global` initializers built as nested `llvm.insertvalue` chains make `LLVMModuleTranslation::convertGlobalsAndAliases` call `ConstantFoldInsertValueInstruction` on every step, rebuilding the whole `ConstantArray` each time. That is O(N²) in the number of elements and shows up as multi-minute compiles on translation units with huge pointer tables (SPEC CPU 2026 `gcc/insn-automata.cc` is the motivating case; Eric Keane's `convertOperationImpl` profile matches this path). This change lets `llvm.mlir.constant` carry an `ArrayAttr` of `FlatSymbolRefAttr` leaves that name globals (not just functions), adds a name-keyed global map beside the existing op-keyed map, and resolves those refs in `getLLVMConstant`. A translate test checks the resulting single LLVM constant array initializer.
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