[llvm] [GSYM] Add support for querying merged functions in llvm-gsymutil (PR #120991)

[Greg Clayton via llvm-commits]

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@@ -132,6 +132,17 @@ class GsymReader {
   /// for failing to lookup the address.
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clayborg wrote:

Add a blurb about using lookupAll if gsym contains merged function info. Say something about this will find the top level function info and not serach the merged function infos.

https://github.com/llvm/llvm-project/pull/120991