[MLIR][OpenMP][OMPIRBuilder] Add lowering support for omp.target_triples (#100156) This patch modifies MLIR to LLVM IR lowering of the OpenMP dialect to take into consideration the contents of the `omp.target_triples` module attribute while generating code for `omp.target` operations. It adds the `OpenMPIRBuilderConfig::TargetTriples` field and initializes it using the `amendOperation` flow of the `OpenMPToLLVMIRTranslation` pass. Some changes are introduced into the `OpenMPIRBuilder` to allow passing the information about whether a target region is intended to be offloaded from outside. The result of this change is that offloading calls are only generated when the `--offload-arch` or `-fopenmp-targets` options are given to the compiler. Otherwise, only the host fallback code is generated. This fixes linker errors currently triggered by `flang-new` if a source file containing a `target` construct is compiled without any of the aforementioned options. Several unit tests impacted by these changes, which are intended to check host code generated for `omp.target` operations, are updated to contain the new attribute. Without it, no calls to `__tgt_target_kernel` and associated control flow operations are generated. Fixes #100209.
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