Merge Clang r202185:

  Debug info: Generate debug info for variadic functions.
  Paired commit with LLVM.

  rdar://problem/13690847

This merege includes changes to use the Clang 3.4 API (revisions
199686 and 200082) in lib/CodeGen/CGDebugInfo.cpp:

getParamType  -> getArgType
getNumParams  -> getNumArgs
getReturnType -> getResultType

Sponsored by:	DARPA, AFRL

Introduced here: http://svnweb.freebsd.org/changeset/base/264827

Index: tools/clang/lib/CodeGen/CGDebugInfo.cpp
===================================================================
--- tools/clang/lib/CodeGen/CGDebugInfo.cpp	(revision 264826)
+++ tools/clang/lib/CodeGen/CGDebugInfo.cpp	(revision 264827)
@@ -37,7 +37,7 @@
 #include "llvm/IR/Module.h"
 #include "llvm/Support/Dwarf.h"
 #include "llvm/Support/FileSystem.h"
-#include "llvm/Support/Path.h"
+#include "llvm/Support/Path.h"
 using namespace clang;
 using namespace clang::CodeGen;
 
@@ -342,9 +342,9 @@
   if (const FileEntry *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
     MainFileDir = MainFile->getDir()->getName();
     if (MainFileDir != ".") {
-      llvm::SmallString<1024> MainFileDirSS(MainFileDir);
-      llvm::sys::path::append(MainFileDirSS, MainFileName);
-      MainFileName = MainFileDirSS.str();
+      llvm::SmallString<1024> MainFileDirSS(MainFileDir);
+      llvm::sys::path::append(MainFileDirSS, MainFileName);
+      MainFileName = MainFileDirSS.str();
     }
   }
 
@@ -760,6 +760,8 @@
   else if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(Ty)) {
     for (unsigned i = 0, e = FPT->getNumArgs(); i != e; ++i)
       EltTys.push_back(getOrCreateType(FPT->getArgType(i), Unit));
+    if (FPT->isVariadic())
+      EltTys.push_back(DBuilder.createUnspecifiedParameter());
   }
 
   llvm::DIArray EltTypeArray = DBuilder.getOrCreateArray(EltTys);
@@ -2420,6 +2422,20 @@
     llvm::DIArray EltTypeArray = DBuilder.getOrCreateArray(Elts);
     return DBuilder.createSubroutineType(F, EltTypeArray);
   }
+
+  // Variadic function.
+  if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
+    if (FD->isVariadic()) {
+      SmallVector<llvm::Value *, 16> EltTys;
+      EltTys.push_back(getOrCreateType(FD->getResultType(), F));
+      if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FnType))
+        for (unsigned i = 0, e = FPT->getNumArgs(); i != e; ++i)
+          EltTys.push_back(getOrCreateType(FPT->getArgType(i), F));
+      EltTys.push_back(DBuilder.createUnspecifiedParameter());
+      llvm::DIArray EltTypeArray = DBuilder.getOrCreateArray(EltTys);
+      return DBuilder.createSubroutineType(F, EltTypeArray);
+    }
+
   return llvm::DICompositeType(getOrCreateType(FnType, F));
 }