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Re: folding STRING_CST + INTEGER_CST
> We'd need to ensure that "hello"+3 != "HELlo"+3 (while still having "lo"
> == "lo"), as well as that (("hello"+3)-3) == "hello", and so on.
another alternative is to fold STRING_CST+INTEGER_CST when we are
building the trees for certain builtins accepting "const char *".
the following come to mind:
strspn, strstr, strcspn, strrchr, strchr, index, fputs
...since we know we don't need equality operations on them.