[NFC] Header cleanup

Removed some unused headers, replaced some headers with forward class declarations.

Found using simple scripts like this one:
clear && ack --cpp -l '#include "llvm/ADT/IndexedMap.h"' | xargs grep -L 'IndexedMap[<]' | xargs grep -n --color=auto 'IndexedMap'

Patch by Eugene Kosov <claprix@yandex.ru>

Differential Revision: http://reviews.llvm.org/D19219

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 266595

1 files changed, 1 insertions, 0 deletions

diff --git a/llvm/unittests/Transforms/IPO/WholeProgramDevirt.cpp b/llvm/unittests/Transforms/IPO/WholeProgramDevirt.cpp
index 2a79f02f83d..794863b0a91 100644
--- a/llvm/unittests/Transforms/IPO/WholeProgramDevirt.cpp
+++ b/llvm/unittests/Transforms/IPO/WholeProgramDevirt.cpp
@@ -8,6 +8,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Transforms/IPO/WholeProgramDevirt.h"
+#include "llvm/ADT/ArrayRef.h"
 #include "gtest/gtest.h"
 
 using namespace llvm;