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Summary: It is not safe for ARMConstantIslands to undoLRSpillRestore. PrologEpilogInserter is the one to ensure stack alignment, taking into consideration LR is spilled or not. For noreturn function with StackAlignment 8 (function contains call/alloc), undoLRSpillRestore cause stack be mis-aligned. Fixing stack alignment in ARMConstantIslands doesn't give us much benefit, as undo LR spill/restore only occur in large function with near branches only, also doesn't have callee-saved LR spill. Reviewers: t.p.northover, rengolin, efriedma, apazos, samparker, ostannard Reviewed By: ostannard Subscribers: dmgreen, ostannard, kristof.beyls, hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D75288
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