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If the stack pointer is altered for local variables and we are generating Thumb2 execute-only code the .pad directive is missing. Usually the size of the adjustment is stored in a PC-relative location and loaded into a register which is then added to the stack pointer. However when we are generating execute-only code code the size of the adjustment is instead generated using the MOVW/MOVT instruction pair. As a by product of handling the execute-only case this also fixes an existing issue that in the none execute-only case the .pad directive was generated against the load of the constant to a register instruction, instead of the instruction which adds the register to the stack pointer. Differential Revision: https://reviews.llvm.org/D76849
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