Index: COFF/ICF.cpp
===================================================================
--- COFF/ICF.cpp
+++ COFF/ICF.cpp
@@ -267,12 +267,14 @@
   });
 
   // Combine the hashes of the sections referenced by each section into its
-  // hash.
+  // hash. This is only needed for ARM64, where the .pdata format makes those
+  // sections less likely to be unique.
   parallelForEach(Chunks, [&](SectionChunk *SC) {
     uint32_t Hash = SC->Class[1];
-    for (Symbol *B : SC->symbols())
-      if (auto *Sym = dyn_cast_or_null<DefinedRegular>(B))
-        Hash ^= Sym->getChunk()->Class[1];
+    if (Config->Machine == ARM64)
+      for (Symbol *B : SC->symbols())
+        if (auto *Sym = dyn_cast_or_null<DefinedRegular>(B))
+          Hash ^= Sym->getChunk()->Class[1];
     // Set MSB to 1 to avoid collisions with non-hash classs.
     SC->Class[0] = Hash | (1U << 31);
   });