[REGRESSION] mainline/master: (build) in arch/x86/include/generated/asm/cpufeaturemasks.h (arch/x86/Make...

New build issue found on mainline/master:

---
 in arch/x86/include/generated/asm/cpufeaturemasks.h (arch/x86/Makefile:269) [logspec:kbuild,kbuild.other]
---

Log excerpt:
=====================================================
Kernel: arch/x86/boot/bzImage is ready  (#1)
+ stage=2
+ cd ..
+ echo job:build_kernel=done
++ date +%s
+ echo jobets:build_kernel=1787335473
+ echo -----log:build_modules-----
-----log:build_modules-----
+ echo job:build_modules=running
++ date +%s
+ echo jobsts:build_modules=1787335473
+ cd /tmp/kci/linux
+ set +eE -o pipefail
+ trap - ERR
+ grep CONFIG_MODULES=y .config
CONFIG_MODULES=y
+ '[' 0 -eq 0 ']'
+ set -eE -o pipefail
+ trap 'case $stage in
+ stage=1
++ nproc
+ make -j16 modules
++ tee /tmp/kci/artifacts/build_modules.log
++ tee /tmp/kci/artifacts/build_modules_stderr.log
mv: cannot stat 'arch/x86/include/generated/asm/.tmp_cpufeaturemasks.h': No such file or directory

=====================================================

When fixing this issue, please attribute this report according to the
patch submission rules:

Reported-by: kernelci.org bot <[email protected]>
Link: https://lore.kernel.org/all/[email protected]/

For complete logs and details about the environment used, see the issue
on the KernelCI dashboard:

- dashboard: https://d.kernelci.org/i/maestro:4f457c5cde619e65f938d53b68735abd5858719f
- giturl: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
- commit HEAD:  531ed942bb0df04f6747983fecdedce76a22d07f

# Builds where the incident occurred:

## i386_defconfig+allnoconfig on (i386):
- compiler: clang-21
- config: https://files.kernelci.org/kbuild-clang-21-i386-allnoconfig-6a888db362f33761c0fe21dc/.config
- dashboard: https://d.kernelci.org/build/maestro:6a888db362f33761c0fe21dc

## i386_defconfig+kselftest on (i386):
- compiler: gcc-14
- config: https://files.kernelci.org/kbuild-gcc-14-i386-kselftest-6a888e4262f33761c0fe2442/.config
- dashboard: https://d.kernelci.org/build/maestro:6a888e4262f33761c0fe2442

#regzbot introduced: 818bebeb63dd6bf5f4e07e145f6cdbace520a34c..531ed942bb0df04f6747983fecdedce76a22d07f
#regzbot link: https://d.kernelci.org/i/maestro:4f457c5cde619e65f938d53b68735abd5858719f

#kernelci issue maestro:4f457c5cde619e65f938d53b68735abd5858719f

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