[llvm] [GVN] MemorySSA for GVN: switch to using MemorySSA by default (PR #221916)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/Scalar/GVN.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Transforms/Scalar/GVN.cpp b/llvm/lib/Transforms/Scalar/GVN.cpp
index dab94286e..186e5e2ba 100644
--- a/llvm/lib/Transforms/Scalar/GVN.cpp
+++ b/llvm/lib/Transforms/Scalar/GVN.cpp
@@ -117,8 +117,7 @@ static cl::opt<bool>
 GVNEnableSplitBackedgeInLoadPRE("enable-split-backedge-in-load-pre",
                                 cl::init(false));
 static cl::opt<bool> GVNEnableMemDep("enable-gvn-memdep", cl::init(false));
-static cl::opt<bool> GVNEnableMemorySSA("enable-gvn-memoryssa",
-                                        cl::init(true));
+static cl::opt<bool> GVNEnableMemorySSA("enable-gvn-memoryssa", cl::init(true));
 
 static cl::opt<unsigned> ScanUsersLimit(
     "gvn-scan-users-limit", cl::Hidden, cl::init(100),

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https://github.com/llvm/llvm-project/pull/221916