[PATCH] Option to suppress the DWARF entries DW_AT_MIPS_linkage_name and DW_AT_linkage_name.

[Wolfgang Pieb]

I’d like to add a backend option (-suppress-dwarf-linkage-names)  to suppress DW_AT_MIPS_linkage_name and DW_AT_linkage_name entries in DWARF. Measurements of debug info size (specifically, the .debug_str section) have shown that some decent reductions are to be had by not emitting these entries, benefiting  DWARF consumers that do not use them.

Please note that the proposed change does not suppress the emission of linkage names into any accelerator tables.

http://reviews.llvm.org/D5510

Files:
  lib/CodeGen/AsmPrinter/DwarfUnit.cpp
  test/DebugInfo/suppress-linkage-entry-3.ll
  test/DebugInfo/suppress-linkage-entry-4.ll
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