On Linux/x86_64,

495ec0b2aa808a6463b8c24288a1730cbae1cfca is the first bad commit
commit 495ec0b2aa808a6463b8c24288a1730cbae1cfca
Author: Aldy Hernandez <al...@redhat.com>
Date:   Mon Oct 19 16:52:51 2020 +0200

    Convert -Walloca pass to ranger.

caused

FAIL: gcc.dg/Walloca-1.c (test for excess errors)
FAIL: gcc.dg/Walloca-1.c  (test for warnings, line 27)

with GCC configured with

Configured with: ../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r11-4134/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=gcc.dg/Walloca-1.c 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gcc.dg/Walloca-1.c 
--target_board='unix{-m32\ -march=cascadelake}'"

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