Rename ClassType to the more accurate UnderlyingType and document its purpose.
rdar://problem/13463793

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179877 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/IR/DIBuilder.cpp b/lib/IR/DIBuilder.cpp
index 9d6e840..0ed61b5 100644
--- a/lib/IR/DIBuilder.cpp
+++ b/lib/IR/DIBuilder.cpp
@@ -427,7 +427,7 @@
 DIObjCProperty DIBuilder::createObjCProperty(StringRef Name,
                                              DIFile File, unsigned LineNumber,
                                              StringRef GetterName,
-                                             StringRef SetterName, 
+                                             StringRef SetterName,
                                              unsigned PropertyAttributes,
                                              DIType Ty) {
   Value *Elts[] = {
@@ -601,7 +601,7 @@
 DICompositeType DIBuilder::createEnumerationType(
     DIDescriptor Scope, StringRef Name, DIFile File, unsigned LineNumber,
     uint64_t SizeInBits, uint64_t AlignInBits, DIArray Elements,
-    DIType ClassType) {
+    DIType UnderlyingType) {
   // TAG_enumeration_type is encoded in DICompositeType format.
   Value *Elts[] = {
     GetTagConstant(VMContext, dwarf::DW_TAG_enumeration_type),
@@ -613,7 +613,7 @@
     ConstantInt::get(Type::getInt64Ty(VMContext), AlignInBits),
     ConstantInt::get(Type::getInt32Ty(VMContext), 0),
     ConstantInt::get(Type::getInt32Ty(VMContext), 0),
-    ClassType,
+    UnderlyingType,
     Elements,
     ConstantInt::get(Type::getInt32Ty(VMContext), 0),
     Constant::getNullValue(Type::getInt32Ty(VMContext))