On Linux/x86_64,

7ee1c0413e251ff0b6a6d526209ef038b9835320 is the first bad commit
commit 7ee1c0413e251ff0b6a6d526209ef038b9835320
Author: Nathan Sidwell <nat...@acm.org>
Date:   Fri Oct 2 11:13:26 2020 -0700

    c++: Hash table iteration for namespace-member spelling suggestions

caused

FAIL: c-c++-common/spellcheck-reserved.c  -std=gnu++14  (test for errors, line 
31)
FAIL: c-c++-common/spellcheck-reserved.c  -std=gnu++14 (test for excess errors)
FAIL: c-c++-common/spellcheck-reserved.c  -std=gnu++17  (test for errors, line 
31)
FAIL: c-c++-common/spellcheck-reserved.c  -std=gnu++17 (test for excess errors)
FAIL: c-c++-common/spellcheck-reserved.c  -std=gnu++2a  (test for errors, line 
31)
FAIL: c-c++-common/spellcheck-reserved.c  -std=gnu++2a (test for excess errors)
FAIL: c-c++-common/spellcheck-reserved.c  -std=gnu++98  (test for errors, line 
31)
FAIL: c-c++-common/spellcheck-reserved.c  -std=gnu++98 (test for excess errors)

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r11-3633/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=c-c++-common/spellcheck-reserved.c 
--target_board='unix{-m64\ -march=cascadelake}'"

(Please do not reply to this email, for question about this report, contact me 
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