[llvm] [NFCI][Globals] In GlobalObjects::setSectionPrefix, do conditional update if existing prefix is not equivalent to the new one. Returns whether prefix changed. (PR #158460)

[Teresa Johnson via llvm-commits]

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@@ -121,8 +121,10 @@ class GlobalObject : public GlobalValue {
   /// appropriate default object file section.
   LLVM_ABI void setSection(StringRef S);
 
-  /// Set the section prefix for this global object.
-  LLVM_ABI void setSectionPrefix(StringRef Prefix);
+  /// If existing prefix is different from \p Prefix is different, set it to
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teresajohnson wrote:

redundant "different"

https://github.com/llvm/llvm-project/pull/158460