[clang] [llvm] [RISCV] CodeGen of RVE and ilp32e/lp64e ABIs (PR #76777)

[Nemanja Ivanovic via cfe-commits]

================
@@ -985,9 +1003,10 @@ void 
RISCVFrameLowering::determineCalleeSaves(MachineFunction &MF,
     };
 
     for (auto Reg : CSRegs)
-      SavedRegs.set(Reg);
+      if (Reg < RISCV::X16 || !Subtarget.isRVE())
----------------
nemanjai wrote:

Sounds good. Maybe just a little comment here to demonstrate to the user that 
this isn't an omission but a conscious decision.

https://github.com/llvm/llvm-project/pull/76777
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