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llvm: Use llvm.memcpy to copy data (#3679)

* llvm, helpers: Use dummy allocation to get correct copy size

Assert that source and destination types match.
Use alloca to create a new object of the copied type.
This allows llvm.getobjsize to correctly get the size of the copied
buffer instead of the entire larger structure.
The allocation is not used beyond getting the size and gets eliminated
by the compiler.

Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>

* llvm, Projection: Use memcpy to implement passthrough execution

Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>

* llvm, Function: Use memcpy helper to copy data

Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>

* llvm, Port: Use memcpy helper to copy data

Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>

* llvm, Mechanism: Use memcpy helper to copy data

Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>

* llvm: Use memcpy helper to copy data

Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>

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Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>

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