[BOLT] Add getter for optional relocations (#133085)

Minor refactoring on comments.

Author: paschalis-mpeis

bolt/include/bolt/Core/Relocation.h

@@ -57,7 +57,8 @@ class Relocation {
   uint32_t Type;
 
 private:
-  /// Relocations added by optimizations can be optional.
+  /// Relocations added by optimizations can be optional, meaning they can be
+  /// omitted under certain circumstances.
   bool Optional = false;
 
 public:
@@ -72,10 +73,10 @@ class Relocation {
   /// Return size in bytes of the given relocation \p Type.
   static size_t getSizeForType(uint32_t Type);
 
-  /// Some relocations added by optimizations are optional, meaning they can be
-  /// omitted under certain circumstances.
   void setOptional() { Optional = true; }
 
+  bool isOptional() { return Optional; }
+
   /// Return size of this relocation.
   size_t getSize() const { return getSizeForType(Type); }