Saleem Abdulrasool 086c12114d IRGen: switch to absolute pointers for nominal type descriptors ...

Alter the value metadata layout to use an absolute pointer for the
nominal type descriptor rather than a relative offset relative to the
complete type metadata.  Although this is slightly less efficient in
terms of load times, this is more portable across different
environments.  For example, PE/COFF does not provide a cross-section
relative offset relocation.  Other platform ports are unable to provide
a 64-bit relative offset encoding.

Given that the value witness table reference in the value metadata is
currently an absolute pointer, this page is most likely going to be
dirtied by the loader.

2017-10-03 14:45:45 -07:00

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