Ensure that the record packing and calling convention are correct regardless of -m32 or -m64 #258
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…ardless of -m32 or -m64
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This resolves #233
ClangSharpPInvokeGenerator was attempting to be "smart" by calculating the alignment itself, but this is potentially problematic for scenarios that differ between 32-bit and 64-bit as the Clang AST will only expose one.
This updates the generator to check for and use the attribute added to records that are under a
#pragma packdirective and rely on that if it exists. This avoids issues like in #233 that were arising when a struct contained pointer types and was#pragma pack 4(which meant "expected packing matches specified packing", when in actuality it differed for 64-bit targets).