[llvm] [AArch64][SVE] Remove isSVECC() in favour of changing the calling convention (PR #152742)

[Benjamin Maxwell via llvm-commits]

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@@ -784,8 +784,6 @@ define void @f6(<vscale x 2 x i64> %x, [8 x i64] %pad, i64 %n9) personality ptr
 ; CHECK-NEXT:  .seh_proc f6
 ; CHECK-NEXT:    .seh_handler __CxxFrameHandler3, @unwind, @except
 ; CHECK-NEXT:  // %bb.0:
-; CHECK-NEXT:    sub sp, sp, #16
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MacDue wrote:

I don't know enough about SEH to tell if this change is significant (to me, it seems insignificant). I also don't know if this case is fully supported.

https://github.com/llvm/llvm-project/pull/152742