[llvm-bugs] [Bug 49517] New: initializer_list storage considered a temporary when accessed through NTTP

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49517

            Bug ID: 49517
           Summary: initializer_list storage considered a temporary when
                    accessed through NTTP
           Product: clang
           Version: trunk
          Hardware: PC
               URL: https://godbolt.org/z/aWGr3P
                OS: Linux
            Status: NEW
          Keywords: compile-fail
          Severity: enhancement
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: johelegp at gmail.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    johelegp at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

See https://godbolt.org/z/aWGr3P.
```C++
#include<initializer_list>
constexpr std::initializer_list<bool>il{true};
template<const bool*B>constexpr bool front=B[0];
static_assert(front<il.begin()>);
```
https://timsong-cpp.github.io/cppwp/n4861/dcl.init.list#5 explains its storage.
https://timsong-cpp.github.io/cppwp/n4861/dcl.init.list#6 explains its
lifetime.

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