Address PR comments

- Remove [[maybe_unused]] from selectExtInst
- Remove redundant include

Author: Icohedron

llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp

@@ -34,7 +34,6 @@
 #include "llvm/IR/IntrinsicsSPIRV.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/raw_ostream.h"
 
 #define DEBUG_TYPE "spirv-isel"
 
@@ -271,10 +270,8 @@ class SPIRVInstructionSelector : public InstructionSelector {
   bool selectPhi(Register ResVReg, const SPIRVType *ResType,
                  MachineInstr &I) const;
 
-  [[maybe_unused]] bool selectExtInst(Register ResVReg,
-                                      const SPIRVType *RestType,
-                                      MachineInstr &I,
-                                      GL::GLSLExtInst GLInst) const;
+  bool selectExtInst(Register ResVReg, const SPIRVType *RestType,
+                     MachineInstr &I, GL::GLSLExtInst GLInst) const;
   bool selectExtInst(Register ResVReg, const SPIRVType *ResType,
                      MachineInstr &I, CL::OpenCLExtInst CLInst) const;
   bool selectExtInst(Register ResVReg, const SPIRVType *ResType,