[CodeGen] Use RegClassFilterFunc where appropriate (NFC)

Author: kazutakahirata

llvm/lib/CodeGen/RegAllocFast.cpp

@@ -1580,8 +1580,7 @@ FunctionPass *llvm::createFastRegisterAllocator() {
   return new RegAllocFast();
 }
 
-FunctionPass *llvm::createFastRegisterAllocator(
-  std::function<bool(const TargetRegisterInfo &TRI,
-                     const TargetRegisterClass &RC)> Ftor, bool ClearVirtRegs) {
+FunctionPass *llvm::createFastRegisterAllocator(RegClassFilterFunc Ftor,
+                                                bool ClearVirtRegs) {
   return new RegAllocFast(Ftor, ClearVirtRegs);
 }

llvm/lib/CodeGen/RegAllocGreedy.cpp

@@ -181,15 +181,10 @@ FunctionPass* llvm::createGreedyRegisterAllocator() {
 }
 
 namespace llvm {
-FunctionPass* createGreedyRegisterAllocator(
-  std::function<bool(const TargetRegisterInfo &TRI,
-                     const TargetRegisterClass &RC)> Ftor);
-
+FunctionPass *createGreedyRegisterAllocator(RegClassFilterFunc Ftor);
 }
 
-FunctionPass* llvm::createGreedyRegisterAllocator(
-  std::function<bool(const TargetRegisterInfo &TRI,
-                     const TargetRegisterClass &RC)> Ftor) {
+FunctionPass *llvm::createGreedyRegisterAllocator(RegClassFilterFunc Ftor) {
   return new RAGreedy(Ftor);
 }