[llvm] [BOLT] Change Relocation Type to 32-bit and add Optional flag (PR #130792)

[Maksim Panchenko via llvm-commits]

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@@ -50,72 +55,79 @@ struct Relocation {
   /// Used to validate relocation correctness.
   uint64_t Value;
 
+  /// Relocations added by optimizations can be optional.
+  bool Optional = false;
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maksfb wrote:

Move the new flag next to Type, such that the size of `struct Relocation` doesn't change.

https://github.com/llvm/llvm-project/pull/130792