[llvm] [DebugInfo][IndVarSimplify] fix missing debug location updates (PR #91443)

[J. Ryan Stinnett via llvm-commits]

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+; RUN: opt < %s -passes=indvars -S | FileCheck %s
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jryans wrote:

Apologies for another file name nit... Just noticed the file name starts with "indvars-", but it's already in the `IndVarSimplify` directory, so the "indvars-" prefix feels redundant (and most existing tests in that directory do not have it), so perhaps best to remove that here.

https://github.com/llvm/llvm-project/pull/91443