[BOLT][DWARF] Change rangelists to use DW_RLE_offset_pair

Before we always used DW_RLE_startx_length. This is not very efficient and leads
to bigger .debug_addr section. Changed it to use
DW_RLE_base_addressx/DW_RLE_offset_pair.

clang-16 build in debug mode
llvm-bolt ran on it with --update-debug-sections
| section | before | after | diff | % decrease |
| .debug_rnglists | 32732292 | 31986051 | -746241 | 2.3% |
| .debug_addr | 14415808 | 14184128 |  -231680 | 1.6% |

Reviewed By: maksfb

Differential Revision: https://reviews.llvm.org/D140439

1 files changed, 2 insertions, 2 deletions

diff --git a/bolt/include/bolt/Core/DebugData.h b/bolt/include/bolt/Core/DebugData.h
index 2b79d64ba85b..1d29a871d362 100644
--- a/bolt/include/bolt/Core/DebugData.h
+++ b/bolt/include/bolt/Core/DebugData.h
@@ -170,7 +170,7 @@ public:
             std::map<DebugAddressRangesVector, uint64_t> &CachedRanges);
 
   /// Add ranges and return offset into section.
-  virtual uint64_t addRanges(const DebugAddressRangesVector &Ranges);
+  virtual uint64_t addRanges(DebugAddressRangesVector &Ranges);
 
   /// Returns an offset of an empty address ranges list that is always written
   /// to .debug_ranges
@@ -232,7 +232,7 @@ public:
       std::map<DebugAddressRangesVector, uint64_t> &CachedRanges) override;
 
   /// Add ranges and return offset into section.
-  uint64_t addRanges(const DebugAddressRangesVector &Ranges) override;
+  uint64_t addRanges(DebugAddressRangesVector &Ranges) override;
 
   std::unique_ptr<DebugBufferVector> releaseBuffer() override {
     return std::move(RangesBuffer);