Use CallerFInfoFunctionCall with btree_gist for numeric types

Andrew Dunstan <andrew@dunslane.net>

Commit: 4b1c68d63e8651094cfe0631682acd999652ea70
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2017-03-21T14:43:27Z
Releases: 10.0
Use CallerFInfoFunctionCall with btree_gist for numeric types

None of the existing types actually need to use this mechanism, but this
will allow support for enum types which will need it. A separate patch
will adjust the varlena types support for consistency.

Reviewed by Tom Lane and Anastasia Lubennikova

Discussion:  http://postgr.es/m/27220.1478360811@sss.pgh.pa.us

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