be properly set. writeTo() may be invoked without a call to
getSerializedSize(), so the generated serialization methods would
write a length of 0 for non-empty packed fields. Just call
getSerializedSize() at the beginning of writeTo(): although this
means that we may compute the byte size needlessly when there
are no packed fields, in practice, getSerializedSize() will
already have been called - all of the writeTo() wrappers in
AbstractMessageLite invoke it.

Tested: new unittest case in WireFormatTest.java now passes

Explicitly call superclass constructor in generated code to avoid pedantic warning.  Based on patch from Oleg Smolsky.

Fix cross-compiling when building in a dedicated build directory.  Fix pointed out by Pierre Kestener.

Make sure to quality calls to std::swap.  Otherwise, if a google::swap() exists (e.g. because the user is using our own dense_hash_map implementation) it will be chosen instead, leading to a compile error.

Don't use RTTI in down_cast if GOOGLE_PROTOBUF_NO_RTTI is defined.  Patch from Chris Masone (of Google).

Don't build unittest_enormous_decsriptor.proto in C++ because it's very slow on older GCCs.  This file was meant for testing Java anyway.

Fix MSVC projects to ensure that protoc is built before lite-test attempts to use it and that lite-test and tests don't attempt to generate the same .pb.* files at the same time.

Remove semi-broken Java thread-local builder freelist 'optimization'.  Maybe bring back later in optional form.

This fixes some issues with the lite profile for the java build in which the lite jar contained the full binary.