FPEnv.h - reduce includes to forward declarations. NFC.

Ensure FPEnv.cpp includes FPEnv.h first to check for hidden dependencies.

llvm/include/llvm/IR/FPEnv.h

@@ -15,12 +15,11 @@
 #ifndef LLVM_IR_FLOATINGPOINT_H
 #define LLVM_IR_FLOATINGPOINT_H
 
-#include "llvm/ADT/APFloat.h"
+#include "llvm/ADT/FloatingPointMode.h"
 #include "llvm/ADT/Optional.h"
-#include "llvm/ADT/StringRef.h"
-#include <stdint.h>
 
 namespace llvm {
+class StringRef;
 
 namespace fp {
 

llvm/lib/IR/FPEnv.cpp

@@ -12,8 +12,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/ADT/StringSwitch.h"
 #include "llvm/IR/FPEnv.h"
+#include "llvm/ADT/StringSwitch.h"
 
 namespace llvm {