[llvm] [SCEVDivision] Add SCEVDivisionPrinterPass with corresponding tests (PR #155832)

[Nikita Popov via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
+; RUN: opt < %s "-passes=print<scev-division>" -disable-output 2>&1 | FileCheck %s
+
+define i8 @add(i8 %x, i8 %y) {
+; CHECK-LABEL: 'add'
+; CHECK-NEXT:  Instruction: %div = sdiv i8 %add, %y
+; CHECK-NEXT:    Numerator: (%x + %y)
+; CHECK-NEXT:    Denominator: %y
+; CHECK-NEXT:    Quotient: 1
+; CHECK-NEXT:    Remainder: %x
+;
+  %add = add i8 %x, %y
+  %div = sdiv i8 %add, %y
+  ret i8 %div
+}
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nikic wrote:

Assuming that the SCEVDivision contract is that `Numerator == (Quotient * Denominator + Remainder)`, then this result is correct, as `%x + %y == 1 * $x + %y`.

https://github.com/llvm/llvm-project/pull/155832