build failure (test error) on ppc64el with lto enabled

**Describe the bug**

It fails testsuite with -flto=auto -ffat-lto-objects CFLAGS on ppc64el

**Steps to reproduce the bug**

export CXXFLAGS="-flto=auto -ffat-lto-objects"

**Does the bug persist in the most recent commit?**

Yes, looks something lto related

**What operating system and version are you using?**

Ubuntu 22.10 development release

**What compiler and version are you using?**

Get:71 http://ftpmaster.internal/ubuntu kinetic/main ppc64el g++-11 ppc64el 11.3.0-3ubuntu1 [10.1 MB]

**What build system are you using?**

cmake

**Additional context**
full build log
https://launchpadlibrarian.net/609859813/buildlog_ubuntu-kinetic-ppc64el.googletest_1.11.0-3build1_BUILDING.txt.gz

Add any other context about the problem here.

Start with the linked full build log and reproduce the testsuite failure using CXXFLAGS="-flto=auto -ffat-lto-objects" on ppc64el with CMake. Identify the failing test or build step and isolate the LTO-related cause; done means the testsuite builds and passes with these flags, or the limitation is clearly documented.

Written by the indexing model from the issue text.