On Linux/x86_64,

79f4e20dd1280e6a44736070b0d5213f9a8f85d4 is the first bad commit
commit 79f4e20dd1280e6a44736070b0d5213f9a8f85d4
Author: Martin Liska <mli...@suse.cz>
Date:   Wed Sep 2 14:30:16 2020 +0200

    Use SIZE_AMOUNT macro for GGC memory allocation numbers.

caused

FAIL: g++.dg/ext/timevar2.C  -std=gnu++14 (test for excess errors)
FAIL: g++.dg/ext/timevar2.C  -std=gnu++98 (test for excess errors)

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r11-3315/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/ext/timevar2.C 
--target_board='unix{-m64\ -march=cascadelake}'"

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