pdl: Implement c++ backend generator
The generated parsing API follows closely with the legacy generator to minimize the porting work, but differs on notable points: - Generated packet view classes *do not* inherit from one another. - Packet fields are now backed in the class. Scalar and typedef fields are backed by value, payload and array fields by slice. - PacketView::Create() now does the parsing work, accessors just return the internal value in case of scalar and typedef fields, or parse the slice in case of payload and array fields. - The generated code eschews the legacy packet runtime in favor of a trimmed down version packet_runtime.h Some features of PDL are not supported: - Payload with a bit shift - Checksums Test: atest pdl_cxx_generator_tests (cherry picked from https://android-review.googlesource.com/q/commit:075d0d3da75e1d4c55781881145851e0a33116e3) Merged-In: Ifcb5b21c7a6e796ed43985132ad8bc4b116f4c48 Change-Id: Ifcb5b21c7a6e796ed43985132ad8bc4b116f4c48
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