[BOLT][NFC] Const-ify getDynamicRelocationAt

Reviewed By: #bolt, maksfb

Differential Revision: https://reviews.llvm.org/D152662

Author: aaupov

bolt/include/bolt/Core/BinaryContext.h

@@ -1165,7 +1165,7 @@ class BinaryContext {
 
   /// Return a dynamic relocation registered at a given \p Address, or nullptr
   /// if there is no dynamic relocation at such address.
-  const Relocation *getDynamicRelocationAt(uint64_t Address);
+  const Relocation *getDynamicRelocationAt(uint64_t Address) const;
 
   /// Remove registered relocation at a given \p Address.
   bool removeRelocationAt(uint64_t Address);

bolt/lib/Core/BinaryContext.cpp

@@ -2100,8 +2100,9 @@ const Relocation *BinaryContext::getRelocationAt(uint64_t Address) const {
   return Section->getRelocationAt(Address - Section->getAddress());
 }
 
-const Relocation *BinaryContext::getDynamicRelocationAt(uint64_t Address) {
-  ErrorOr<BinarySection &> Section = getSectionForAddress(Address);
+const Relocation *
+BinaryContext::getDynamicRelocationAt(uint64_t Address) const {
+  ErrorOr<const BinarySection &> Section = getSectionForAddress(Address);
   if (!Section)
     return nullptr;