pgsql: Test most StaticAssert macros in C++ extensions

Test most StaticAssert macros in C++ extensions

Most of the StaticAssert macros already worked in C++ with Clang and
GCC:(the only compilers we're currently testing C++ extension support
for). This adds a regression test for them in our test C++ extension,
so we can safely change their implementation without accidentally
breaking C++.

The only macros that StaticAssert macros that don't work yet are the
StaticAssertVariableIsOfType and StaticAssertVariableIsOfTypeMacro.
These will be added in a follow-on commit.

Author: Jelte Fennema-Nio <postgres(at)jeltef(dot)nl>
Discussion: https://www.postgresql.org/message-id/flat/CAGECzQR21OnnKiZO_1rLWO0-16kg1JBxnVq-wymYW0-_1cUNtg(at)mail(dot)gmail(dot)com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/451650eaacd5e482380f2b0e506fc81f5aa92fc7

Modified Files
--------------
src/test/modules/test_cplusplusext/test_cplusplusext.cpp | 5 +++++
1 file changed, 5 insertions(+)