[NFC] Remove redundant includes for llvm/ADT/StringMap.h.

Author: varungandhi-apple

include/swift/Basic/SourceManager.h

@@ -17,7 +17,6 @@
 #include "swift/Basic/SourceLoc.h"
 #include "clang/Basic/FileManager.h"
 #include "llvm/ADT/Optional.h"
-#include "llvm/ADT/StringMap.h"
 #include "llvm/Support/SourceMgr.h"
 #include <map>
 

include/swift/Driver/Driver.h

@@ -25,7 +25,6 @@
 #include "swift/Basic/Sanitizers.h"
 #include "swift/Driver/Util.h"
 #include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringRef.h"
 
 #include <functional>

include/swift/Driver/FineGrainedDependencyDriverGraph.h

@@ -21,7 +21,6 @@
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/iterator_range.h"
 #include "llvm/Support/Path.h"

include/swift/SIL/SILFunction.h

@@ -26,7 +26,6 @@
 #include "swift/SIL/SILDeclRef.h"
 #include "swift/SIL/SILLinkage.h"
 #include "swift/SIL/SILPrintContext.h"
-#include "llvm/ADT/StringMap.h"
 
 /// The symbol name used for the program entry point function.
 #define SWIFT_ENTRY_POINT_FUNCTION "main"