Add some missing includes (#3045)

llvm-spirv.cpp was relying on transitive includes for these.

Also remove an unneeded `<set>` include.

Original commit:
KhronosGroup/SPIRV-LLVM-Translator@cedb8ae2e22102e

Author: svenvh

llvm-spirv/tools/llvm-spirv/llvm-spirv.cpp

@@ -45,6 +45,10 @@
 ///
 //===----------------------------------------------------------------------===//
 
+#include "llvm/ADT/APFloat.h"
+#include "llvm/ADT/APInt.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
 #include "llvm/Bitcode/BitcodeReader.h"
 #include "llvm/Bitcode/BitcodeWriter.h"
 #include "llvm/IR/Constants.h"
@@ -55,10 +59,12 @@
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/FileSystem.h"
+#include "llvm/Support/MathExtras.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/PrettyStackTrace.h"
 #include "llvm/Support/Signals.h"
 #include "llvm/Support/ToolOutputFile.h"
+#include "llvm/Support/raw_ostream.h"
 
 #ifdef LLVM_SPIRV_HAVE_SPIRV_TOOLS
 #include "spirv-tools/libspirv.hpp"
@@ -74,7 +80,6 @@
 #include <iostream>
 #include <map>
 #include <memory>
-#include <set>
 #include <sstream>
 #include <string>