[r11-5712 Regression] FAIL: g++.dg/template/pr98116.C -std=c++2a (test for excess errors) on Linux/x86_64

[sunil.k.pandey]

On Linux/x86_64,

7254a78cf4c419a9b9361289d8c535130cf1dfd0 is the first bad commit
commit 7254a78cf4c419a9b9361289d8c535130cf1dfd0
Author: Nathan Sidwell <nathan@acm.org>
Date:   Thu Dec 3 08:40:43 2020 -0800

    c++: Testcases [PR 98115]

caused

FAIL: g++.dg/template/pr98116.C  -std=c++2a (internal compiler error)
FAIL: g++.dg/template/pr98116.C  -std=c++2a (test for excess errors)

with GCC configured with

../../gcc/configure --prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r11-5712/usr --enable-clocale=gnu --with-system-zlib --with-demangler-in-ld --with-fpmath=sse --enable-languages=c,c++,fortran --enable-cet --without-isl --enable-libmpx x86_64-linux --disable-bootstrap

To reproduce:

$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/template/pr98116.C --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/template/pr98116.C --target_board='unix{-m32\ -march=cascadelake}'"

(Please do not reply to this email, for question about this report, contact me at skpgkp2 at gmail dot com)