[llvm] [GlobalISel] Add a update_givaluetracking_test_checks.py script (PR #140296)

[David Green via llvm-commits]

================
@@ -0,0 +1,20 @@
+# 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 -filetype=null 2>&1 | FileCheck %s
+
+---
+name:            Cst
+body:             |
+  bb.1:
+    %0:_(s8) = G_CONSTANT i8 1
+    %1:_(s8) = COPY %0
----------------
davemgreen wrote:

They should be added in, to match the output in the const.mir.expected test.

https://github.com/llvm/llvm-project/pull/140296