[mlir][NFC] Remove the STLExtras.h header file now that it has been merged into LLVM.

Now that no more utilities exist within, this file can be deleted.

Differential Revision: https://reviews.llvm.org/D78079

Author: River707

llvm/unittests/ADT/TypeTraitsTest.cpp

@@ -33,17 +33,16 @@ template <typename CallableT> struct CheckFunctionTraits {
 using FuncType = bool (*)(const int &);
 struct CheckFunctionPointer : CheckFunctionTraits<FuncType> {};
 
-static bool func(const int &v);
-struct CheckFunctionPointer2 : CheckFunctionTraits<decltype(&func)> {};
-
 /// Test method pointers.
 struct Foo {
   bool func(const int &v);
 };
 struct CheckMethodPointer : CheckFunctionTraits<decltype(&Foo::func)> {};
 
 /// Test lambda references.
-auto lambdaFunc = [](const int &v) -> bool { return true; };
+LLVM_ATTRIBUTE_UNUSED auto lambdaFunc = [](const int &v) -> bool {
+  return true;
+};
 struct CheckLambda : CheckFunctionTraits<decltype(lambdaFunc)> {};
 
 } // end anonymous namespace
@@ -70,7 +69,7 @@ static_assert(!is_detected<has_foo_method_t, NoFooMethod>::value,
 // is_invocable
 //===----------------------------------------------------------------------===//
 
-static void invocable_fn(int) {}
+void invocable_fn(int);
 
 static_assert(is_invocable<decltype(invocable_fn), int>::value,
               "expected function to be invocable");

mlir/examples/toy/Ch1/parser/AST.cpp

@@ -12,7 +12,6 @@
 
 #include "toy/AST.h"
 
-#include "mlir/Support/STLExtras.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/ADT/TypeSwitch.h"
 #include "llvm/Support/raw_ostream.h"

mlir/examples/toy/Ch2/parser/AST.cpp

@@ -12,7 +12,6 @@
 
 #include "toy/AST.h"
 
-#include "mlir/Support/STLExtras.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/ADT/TypeSwitch.h"
 #include "llvm/Support/raw_ostream.h"

mlir/examples/toy/Ch3/parser/AST.cpp

@@ -12,7 +12,6 @@
 
 #include "toy/AST.h"
 
-#include "mlir/Support/STLExtras.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/ADT/TypeSwitch.h"
 #include "llvm/Support/raw_ostream.h"

mlir/examples/toy/Ch4/parser/AST.cpp

@@ -12,7 +12,6 @@
 
 #include "toy/AST.h"
 
-#include "mlir/Support/STLExtras.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/ADT/TypeSwitch.h"
 #include "llvm/Support/raw_ostream.h"

mlir/examples/toy/Ch5/parser/AST.cpp

@@ -12,7 +12,6 @@
 
 #include "toy/AST.h"
 
-#include "mlir/Support/STLExtras.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/ADT/TypeSwitch.h"
 #include "llvm/Support/raw_ostream.h"

mlir/examples/toy/Ch6/parser/AST.cpp

@@ -12,7 +12,6 @@
 
 #include "toy/AST.h"
 
-#include "mlir/Support/STLExtras.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/ADT/TypeSwitch.h"
 #include "llvm/Support/raw_ostream.h"

mlir/examples/toy/Ch7/parser/AST.cpp

@@ -12,7 +12,6 @@
 
 #include "toy/AST.h"
 
-#include "mlir/Support/STLExtras.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/ADT/TypeSwitch.h"
 #include "llvm/Support/raw_ostream.h"

mlir/include/mlir/IR/Diagnostics.h

@@ -14,7 +14,6 @@
 #define MLIR_IR_DIAGNOSTICS_H
 
 #include "mlir/IR/Location.h"
-#include "mlir/Support/STLExtras.h"
 #include <functional>
 
 namespace llvm {

mlir/include/mlir/Pass/PassOptions.h

@@ -16,7 +16,6 @@
 
 #include "mlir/Support/LLVM.h"
 #include "mlir/Support/LogicalResult.h"
-#include "mlir/Support/STLExtras.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Compiler.h"