This patch introduces support for the `DW_AT_LLVM_stmt_sequence`
attribute in the GSYM DWARF transformer. With this change, the DWARF
GSYM creation process can now accurately associate debug information
with the correct functions, even when multiple functions have been
merged together.
The `macho-gsym-merged-callsites-dsym.yaml` test data is regenerated to
include the fixes in the DWARF linker
(https://github.com/llvm/llvm-project/pull/128953) and the test is
updated to check that debug data is correctly associated for merged
functions.
28fc00b10e