[lld] Support thumb PLTs (#86223) We are using PLTs for cortex-m33 which only supports thumb. More specifically, this is for a very restricted use case. There's no MMU so there's no sharing of virtual addresses between two processes, but this is fine. The MCU is used for running [chre nanoapps](https://android.googlesource.com/platform/system/chre/+/HEAD/doc/nanoapp_overview.md) for android. Each nanoapp is a shared library (but effectively acts as an executable containing a test suite) that is loaded and run on the MCU one binary at a time and there's only one process running at a time, so we ensure that the same text segment cannot be shared by two different running executables. GNU LD supports thumb PLTs but we want to migrate to a clang toolchain and use LLD, so thumb PLTs are needed.
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