[llvm-exegesis] Remove unnecessary includes (NFC)

Identified with clangd.

Author: kazutakahirata

llvm/tools/llvm-exegesis/lib/Analysis.cpp

@@ -13,7 +13,6 @@
 #include "llvm/MC/MCTargetOptions.h"
 #include "llvm/Support/FormatVariadic.h"
 #include <limits>
-#include <unordered_set>
 #include <vector>
 
 namespace llvm {

llvm/tools/llvm-exegesis/lib/Analysis.h

@@ -23,7 +23,6 @@
 #include "llvm/Support/Error.h"
 #include "llvm/Support/raw_ostream.h"
 #include <memory>
-#include <set>
 
 namespace llvm {
 namespace exegesis {

llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp

@@ -16,7 +16,6 @@
 #include "PerfHelper.h"
 #include "SubprocessMemory.h"
 #include "Target.h"
-#include "llvm/ADT/ScopeExit.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/Twine.h"

llvm/tools/llvm-exegesis/lib/SchedClassResolution.cpp

@@ -12,8 +12,6 @@
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MCA/Support.h"
 #include "llvm/Support/FormatVariadic.h"
-#include <limits>
-#include <unordered_set>
 #include <vector>
 
 namespace llvm {

llvm/unittests/tools/llvm-exegesis/Mips/SnippetGeneratorTest.cpp

@@ -15,8 +15,6 @@
 #include "SerialSnippetGenerator.h"
 #include "TestBase.h"
 
-#include <unordered_set>
-
 namespace llvm {
 namespace exegesis {
 namespace {

llvm/unittests/tools/llvm-exegesis/PowerPC/SnippetGeneratorTest.cpp

@@ -15,8 +15,6 @@
 #include "SerialSnippetGenerator.h"
 #include "TestBase.h"
 
-#include <unordered_set>
-
 namespace llvm {
 namespace exegesis {
 namespace {