Rename RCLASS_EXT() macro to RCLASS_EXT_PRIME() to prevent using it wrongly
The macro RCLASS_EXT() accesses the prime classext directly, but it can be valid only in a limited situation when namespace is enabled. So, to prevent using RCLASS_EXT() in the wrong way, rename the macro and let the developer check it is ok to access the prime classext or not.
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Rename RCLASS_EXT() macro to RCLASS_EXT_PRIME() to prevent using it wrongly
The macro RCLASS_EXT() accesses the prime classext directly, but it can be
valid only in a limited situation when namespace is enabled.
So, to prevent using RCLASS_EXT() in the wrong way, rename the macro and
let the developer check it is ok to access the prime classext or not.