[llvm] [BOLT] Fix DWARF4/5 file index handling in debug info functions (PR #151401)

[Alexander Yermolovich via llvm-commits]

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+// Check that BOLT correctly handles two CUs with DWARF-5 debug info (does not crash).
+
+// REQUIRES: system-linux
+
+// RUN: %clang -g -gdwarf-5 -O1 -xc++ %s -o %t-main.o -c
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ayermolo wrote:

See if Inputs/dwarf5_main.s and Inputs/dwarf5_helper.s
can be re-used.

https://github.com/llvm/llvm-project/pull/151401