[llvm-bugs] [Bug 25646] New: [Feature] Use builtin __make_integer_seq to implement std::make_integer_sequence when supported

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https://llvm.org/bugs/show_bug.cgi?id=25646

            Bug ID: 25646
           Summary: [Feature] Use builtin __make_integer_seq to implement
                    std::make_integer_sequence when supported
           Product: libc++
           Version: 3.7
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ldionne.2 at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com
    Classification: Unclassified

Created attachment 15355
  --> https://llvm.org/bugs/attachment.cgi?id=15355&action=edit
Patch

Clang's R252036 added a builtin __make_integer_seq to create large integer
sequences quickly. libc++ should use this builtin whenever possible. The
attached patch passes all of libc++'s unit tests on my machine.

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