mips: increase stack alignment in clone to match the ABI
In "mips: align stack in clone [BZ #28223]" (commit 1f51cd9a) I made a mistake: I misbelieved one "word" was 2-byte and "doubleword" should be 4-byte. But in MIPS ABI one "word" is defined 32-bit (4-byte), so "doubleword" is 8-byte [1], and "quadword" is 16-byte [2]. [1]: "System V Application Binary Interface: MIPS(R) RISC Processor Supplement, 3rd edition", page 3-31 [2]: "MIPSpro(TM) 64-Bit Porting and Transition Guide", page 23
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