[llvm] Stop including llvm/ADT/SmallString.h (NFC)

Identified with clangd.

Author: kazutakahirata

llvm/include/llvm/DebugInfo/LogicalView/Core/LVSupport.h

@@ -14,7 +14,6 @@
 #define LLVM_DEBUGINFO_LOGICALVIEW_CORE_LVSUPPORT_H
 
 #include "llvm/ADT/SmallBitVector.h"
-#include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/DebugInfo/LogicalView/Core/LVStringPool.h"
 #include "llvm/Support/Debug.h"

llvm/lib/DWARFLinkerParallel/DWARFLinkerUnit.h

@@ -11,7 +11,6 @@
 
 #include "DWARFLinkerGlobalData.h"
 #include "OutputSections.h"
-#include "llvm/ADT/SmallString.h"
 #include "llvm/CodeGen/DIE.h"
 #include "llvm/DWARFLinkerParallel/DWARFLinker.h"
 #include "llvm/DWARFLinkerParallel/StringPool.h"

llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp

@@ -16,7 +16,6 @@
 #include "TargetInfo/RISCVTargetInfo.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallBitVector.h"
-#include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/ADT/StringExtras.h"

llvm/tools/llvm-dwarfutil/Options.h

@@ -9,7 +9,6 @@
 #ifndef LLVM_TOOLS_LLVM_DWARFUTIL_OPTIONS_H
 #define LLVM_TOOLS_LLVM_DWARFUTIL_OPTIONS_H
 
-#include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringRef.h"
 
 namespace llvm {

llvm/tools/llvm-reduce/TestRunner.h

@@ -10,7 +10,6 @@
 #define LLVM_TOOLS_LLVM_REDUCE_TESTRUNNER_H
 
 #include "ReducerWorkItem.h"
-#include "llvm/ADT/SmallString.h"
 #include "llvm/IR/Module.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/FileSystem.h"

llvm/unittests/TextAPI/TextStubHelpers.h

@@ -6,7 +6,6 @@
 //
 //===-----------------------------------------------------------------------===/
 
-#include "llvm/ADT/SmallString.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/TextAPI/InterfaceFile.h"
 #include <algorithm>