[llvm] [SelectionDAG]Salvage debuginfo when combining load and sext instrs. (PR #169779)

[Orlando Cazalet-Hyams via llvm-commits]

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+
+# RUN: llc -O2 %s -mtriple=x86_64-unkown-linux -start-before=x86-isel -stop-after=x86-isel -o - | FileCheck %s --check-prefix=MIR
+# RUN: llc -O2 %s -start-before=x86-isel -mtriple=x86_64-unkown-linux --filetype=obj -o %t.o 
+# RUN: llvm-dwarfdump %t.o --name Idx | FileCheck %s --check-prefix=DUMP
+
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OCHyams wrote:

Could you add a sentence explaining the purpose of the test for future archaeologists?

https://github.com/llvm/llvm-project/pull/169779