Cleanup dump() functions.

We had various variants of defining dump() functions in LLVM. Normalize
them (this should just consistently implement the things discussed in
http://lists.llvm.org/pipermail/cfe-dev/2014-January/034323.html

For reference:
- Public headers should just declare the dump() method but not use
  LLVM_DUMP_METHOD or #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
- The definition of a dump method should look like this:
  #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
  LLVM_DUMP_METHOD void MyClass::dump() {
    // print stuff to dbgs()...
  }
  #endif

llvm-svn: 293359
diff --git a/llvm/lib/IR/ConstantRange.cpp b/llvm/lib/IR/ConstantRange.cpp
index a85ad46..f940955 100644
--- a/llvm/lib/IR/ConstantRange.cpp
+++ b/llvm/lib/IR/ConstantRange.cpp
@@ -996,11 +996,13 @@
     OS << "[" << Lower << "," << Upper << ")";
 }
 
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
 /// dump - Allow printing from a debugger easily...
 ///
 LLVM_DUMP_METHOD void ConstantRange::dump() const {
   print(dbgs());
 }
+#endif
 
 ConstantRange llvm::getConstantRangeFromMetadata(const MDNode &Ranges) {
   const unsigned NumRanges = Ranges.getNumOperands() / 2;