[llvm] [RISCV][NFC] Simplify calls.ll and autogenerate checks for tail-calls.ll (PR #79248)

[Alex Bradbury via llvm-commits]

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@@ -124,9 +179,61 @@ entry:
 ; this.
 declare void @callee_irq()
 define void @caller_irq() #0 {
-; CHECK-LABEL: caller_irq
-; CHECK-NOT: tail callee_irq
-; CHECK: call callee_irq
+; CHECK-LABEL: caller_irq:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    addi sp, sp, -64
+; CHECK-NEXT:    .cfi_def_cfa_offset 64
+; CHECK-NEXT:    sw ra, 60(sp) # 4-byte Folded Spill
+; CHECK-NEXT:    sw t0, 56(sp) # 4-byte Folded Spill
+; CHECK-NEXT:    sw t1, 52(sp) # 4-byte Folded Spill
+; CHECK-NEXT:    sw t2, 48(sp) # 4-byte Folded Spill
+; CHECK-NEXT:    sw a0, 44(sp) # 4-byte Folded Spill
+; CHECK-NEXT:    sw a1, 40(sp) # 4-byte Folded Spill
+; CHECK-NEXT:    sw a2, 36(sp) # 4-byte Folded Spill
+; CHECK-NEXT:    sw a3, 32(sp) # 4-byte Folded Spill
+; CHECK-NEXT:    sw a4, 28(sp) # 4-byte Folded Spill
+; CHECK-NEXT:    sw a5, 24(sp) # 4-byte Folded Spill
+; CHECK-NEXT:    sw a6, 20(sp) # 4-byte Folded Spill
+; CHECK-NEXT:    sw a7, 16(sp) # 4-byte Folded Spill
+; CHECK-NEXT:    sw t3, 12(sp) # 4-byte Folded Spill
+; CHECK-NEXT:    sw t4, 8(sp) # 4-byte Folded Spill
+; CHECK-NEXT:    sw t5, 4(sp) # 4-byte Folded Spill
+; CHECK-NEXT:    sw t6, 0(sp) # 4-byte Folded Spill
+; CHECK-NEXT:    .cfi_offset ra, -4
----------------
asb wrote:

Is the call frame information interesting for this test, or is this a case where we should really add `nounwind` to make the output less noisy. I _think_ it's the latter and we should just add nounwind.

https://github.com/llvm/llvm-project/pull/79248