[llvm] [GlobalISel] Add computeNumSignBits for SHL (PR #152067)

[Yi-Chi Lee via llvm-commits]

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+# NOTE: Assertions have been autogenerated by utils/update_givaluetracking_test_checks.py UTC_ARGS: --version 5
+# RUN: llc -mtriple aarch64 -passes="print<gisel-value-tracking>" %s -o - 2>&1 | FileCheck %s
+
+---
+name:            Cst
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yichi170 wrote:

I updated the test. Let me know if it doesn't align with what you expect!

https://github.com/llvm/llvm-project/pull/152067