[Backport v4.0-branch] arch: arm: cortex_m: Force literal pool placement in inline asm block #93125
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When LTO is enabled, linker may relocate literal pools out of Thumb LDR instruction's reach causing "offset out of range" errors while linking. This commit adds `.ltorg` directive in the inline asm blocks where absolute addresses are loaded using the `ldr` instructions, in order to ensure that the literal pool containing the absolute addresses are placed near the `ldr` instructions. Note that the `.ltorg` directive is recognised by all toolchains supported by Zephyr and no toolchain abstraction is provided for now. Signed-off-by: Stephanos Ioannidis <[email protected]> (cherry picked from commit d7d3ae5)
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Backport d7d3ae5 from #92569.
Fixes #90777