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LTO linker error with GNU Arm 10.3-2021.07

I have attempted to upgrade the toolchain on a project for a Cortex-M0+ that requires LTO to fit in flash. The project has built just fine up until now, but after upgrading to the latest 10.3-2021.07 version, the linking stage fails. Here's what the output looks like:

Has anyone seen anything like this before? I tried searching for help on this, but came up blank. I'm unsure about how I should even start approaching this as I was unable to even keep the temporary assembler output from the LTO process.

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