[llvm] [refactor] Split LLVMCompiledData of kernels and tasks

[lin-hitonami]

Related issue = #5511
The compiler first compiles every offloaded task to a LLVMCompiledTask which contains an LLVM module, the name of the offloaded task function inside the module, and some extra information for linking. Then, The compiler links the modules in the LLVMCompiledTasks, the runtime modules and the struct modules used in the kernel together, and creates a LLVMCompiledKernel that contain the linked LLVM module and the names of the offloaded tasks.

Both LLVMCompiledTask and LLVMCompiledKernel need to store the generated LLVM module and the names of the functions of the offloaded tasks inside the module. LLVMCompiledTask also stores additional information which will be used when linking like which SNodeTrees are used and the sizes of TLS buffers used in parallel struct for.

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[ailzhang]

Thanks!