Add special case fast-paths for strict functions

Many STRICT function calls will have one or two arguments, in which
case we can speed up checking for NULL input by avoiding setting up
a loop over the arguments. This adds EEOP_FUNCEXPR_STRICT_1 and the
corresponding EEOP_FUNCEXPR_STRICT_2 for functions with one and two
arguments respectively.

Author: Andres Freund <[email protected]>
Co-authored-by: Daniel Gustafsson <[email protected]>
Reviewed-by: Andreas Karlsson <[email protected]>
Discussion: https://postgr.es/m/[email protected]
Discussion: 
https://postgr.es/m/[email protected]

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/d35d32d7112bc632c6a305e9dffdec0082bbdf00

Modified Files
--------------
src/backend/executor/execExpr.c       | 13 +++++-
src/backend/executor/execExprInterp.c | 74 ++++++++++++++++++++++++++++++++++-
src/backend/jit/llvm/llvmjit_expr.c   |  7 +++-
src/include/executor/execExpr.h       |  7 +++-
4 files changed, 96 insertions(+), 5 deletions(-)

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