[llvm] [CodeGen] Refactor `determineCalleeSaves`. (PR #166763)

[Craig Topper via llvm-commits]

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@@ -69,6 +69,10 @@ static cl::opt<bool> UseMIPSCCMovInsn("use-riscv-mips-ccmov",
                                       cl::desc("Use 'mips.ccmov' instruction"),
                                       cl::init(true), cl::Hidden);
 
+static cl::opt<bool> SaveCSREarly("riscv-save-csrs-early",
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topperc wrote:

I don't think "early" is a good name. Early here refers to pass ordering within the compiler, but it could be interpreted by a reader has referring to something at runtime.

https://github.com/llvm/llvm-project/pull/166763