[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

3 files changed, 0 insertions, 3 deletions

diff --git a/llvm/lib/Transforms/ObjCARC/ObjCARC.cpp b/llvm/lib/Transforms/ObjCARC/ObjCARC.cpp
index d860723bb46..688dd12c408 100644
--- a/llvm/lib/Transforms/ObjCARC/ObjCARC.cpp
+++ b/llvm/lib/Transforms/ObjCARC/ObjCARC.cpp
@@ -17,7 +17,6 @@
 #include "llvm-c/Core.h"
 #include "llvm-c/Initialization.h"
 #include "llvm/InitializePasses.h"
-#include "llvm/Support/CommandLine.h"
 
 namespace llvm {
   class PassRegistry;
diff --git a/llvm/lib/Transforms/ObjCARC/ObjCARC.h b/llvm/lib/Transforms/ObjCARC/ObjCARC.h
index 5fd45b00af1..f02b75f0b45 100644
--- a/llvm/lib/Transforms/ObjCARC/ObjCARC.h
+++ b/llvm/lib/Transforms/ObjCARC/ObjCARC.h
@@ -24,7 +24,6 @@
 #define LLVM_LIB_TRANSFORMS_OBJCARC_OBJCARC_H
 
 #include "llvm/ADT/StringSwitch.h"
-#include "llvm/ADT/Optional.h"
 #include "llvm/Analysis/AliasAnalysis.h"
 #include "llvm/Analysis/ObjCARCAnalysisUtils.h"
 #include "llvm/Analysis/ObjCARCInstKind.h"
diff --git a/llvm/lib/Transforms/ObjCARC/ObjCARCExpand.cpp b/llvm/lib/Transforms/ObjCARC/ObjCARCExpand.cpp
index 53c19c39f97..bb6a0a0e73d 100644
--- a/llvm/lib/Transforms/ObjCARC/ObjCARCExpand.cpp
+++ b/llvm/lib/Transforms/ObjCARC/ObjCARCExpand.cpp
@@ -24,7 +24,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "ObjCARC.h"
-#include "llvm/ADT/StringRef.h"
 #include "llvm/IR/Function.h"
 #include "llvm/IR/InstIterator.h"
 #include "llvm/IR/Instruction.h"