[PATCH] D129727: [ARM64EC 11/?] Add support for lowering variadic indirect calls.

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Part of initial Arm64EC patchset.
Variadic function's exit thunk is different from normal function. It need to allocate a dynamic stack allocation on the bottom of stack. Then copy the original arguments on the stack to the new allocation.
When we have a varargs function that returns the value in a register on AArch64, but requires an “sret” return on x64, we need to shuffle around the argument registers, and store x3 to the stack with 8bytes alignment.


https://reviews.llvm.org/D129727

Files:
  llvm/lib/Target/AArch64/AArch64Arm64ECCallLowering.cpp
  llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/arm64ec-cfg.ll

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