gimple: fix strlen+more for references

I found that the strlen pass ignores stores via references.
This shows up with C++ code more than C.
A simple:
```
int g(void)
{
  std::string a="a";
  return __builtin_strlen(a.c_str());
}
```
Should be optimized to just `return 1` but does not
currently due to use of references.
The problem in the code is direct comparison with POINTER_TYPE instead
of using POINTER_TYPE_P.
This fixes the cases I found all related to strings passes. All of them
were added by Martin Sebor which makes me think this was an oversight on his
part.

Bootstrapped and tested on x86_64-linux-gnu.

	PR tree-optimization/122754
gcc/ChangeLog:

	* gimple-fold.cc (get_range_strlen_tree): Use POINTER_TYPE_P instead
	of direct comparing to POINTER_TYPE.
	* gimple-ssa-sprintf.cc (format_integer): Likewise.
	* gimple-ssa-warn-access.cc (maybe_warn_nonstring_arg): Likewise.
	* gimple-ssa-warn-restrict.cc (pass_wrestrict::check_call): Likewise.
	* tree-ssa-strlen.cc (maybe_set_strlen_range): Likewise.
	(is_strlen_related_p): Likewise.
	(strlen_pass::handle_assign): Likewise.

gcc/testsuite/ChangeLog:

	* g++.dg/tree-ssa/string-strlen-1.C: New test.

Signed-off-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>

0 files changed, 0 insertions, 0 deletions