Reapply "[SandboxVec][Interval][NFC] Move a few definitions from header to .cpp"

This reverts commit 069fbeb.

Author: Vasileios Porpodas

llvm/include/llvm/Transforms/Vectorize/SandboxVectorizer/Interval.h

@@ -136,13 +136,7 @@ template <typename T> class Interval {
     return bottom()->comesBefore(Other.top());
   }
   /// \Returns true if this and \p Other have nothing in common.
-  bool disjoint(const Interval &Other) const {
-    if (Other.empty())
-      return true;
-    if (empty())
-      return true;
-    return Other.Bottom->comesBefore(Top) || Bottom->comesBefore(Other.Top);
-  }
+  bool disjoint(const Interval &Other) const;
   /// \Returns the intersection between this and \p Other.
   // Example:
   // |----|   this
@@ -232,23 +226,7 @@ template <typename T> class Interval {
   }
 
 #ifndef NDEBUG
-  void print(raw_ostream &OS) const {
-    auto *Top = top();
-    auto *Bot = bottom();
-    OS << "Top: ";
-    if (Top != nullptr)
-      OS << *Top;
-    else
-      OS << "nullptr";
-    OS << "\n";
-
-    OS << "Bot: ";
-    if (Bot != nullptr)
-      OS << *Bot;
-    else
-      OS << "nullptr";
-    OS << "\n";
-  }
+  void print(raw_ostream &OS) const;
   LLVM_DUMP_METHOD void dump() const;
 #endif
 };

llvm/lib/Transforms/Vectorize/SandboxVectorizer/Interval.cpp

@@ -13,10 +13,36 @@
 
 namespace llvm::sandboxir {
 
-template class Interval<Instruction>;
-template class Interval<MemDGNode>;
+template <typename T> bool Interval<T>::disjoint(const Interval &Other) const {
+  if (Other.empty())
+    return true;
+  if (empty())
+    return true;
+  return Other.Bottom->comesBefore(Top) || Bottom->comesBefore(Other.Top);
+}
 
 #ifndef NDEBUG
+template <typename T> void Interval<T>::print(raw_ostream &OS) const {
+  auto *Top = top();
+  auto *Bot = bottom();
+  OS << "Top: ";
+  if (Top != nullptr)
+    OS << *Top;
+  else
+    OS << "nullptr";
+  OS << "\n";
+
+  OS << "Bot: ";
+  if (Bot != nullptr)
+    OS << *Bot;
+  else
+    OS << "nullptr";
+  OS << "\n";
+}
 template <typename T> void Interval<T>::dump() const { print(dbgs()); }
 #endif
+
+template class Interval<Instruction>;
+template class Interval<MemDGNode>;
+
 } // namespace llvm::sandboxir