[CHANGES]
- Define the XPI_OPERAND_ONLY_LOOK flag
- Define a callchecker for list/list infix operators. Add a
callchecker that can optimise out certain kinds of operations
(ref to padav or pkgav, anonlist if XPI_OPERAND_ONLY_LOOK is set)
[BUGFIXES]
- cygwin requires deparse_infix to be declared with XS_INTERNAL()
(RT139449)
- Some architectures require intermediate storage for values in the
test function pp_addpairs (RT139445)
- Fix conditions in lexical variable type checking (RT139444)