[IR] Inline Type::getScalarType() by using isVectorTy() and getVectorElementType() that were already available inline.

Seems to have very little compiled code size impact. But might give a tiny performance boost.

llvm-svn: 299811

Author: topperc

llvm/include/llvm/IR/Type.h

@@ -290,7 +290,11 @@ class Type {
 
   /// If this is a vector type, return the element type, otherwise return
   /// 'this'.
-  Type *getScalarType() const LLVM_READONLY;
+  Type *getScalarType() const {
+    if (isVectorTy())
+      return getVectorElementType();
+    return const_cast<Type*>(this);
+  }
 
   //===--------------------------------------------------------------------===//
   // Type Iteration support.

llvm/lib/IR/Type.cpp

@@ -41,12 +41,6 @@ Type *Type::getPrimitiveType(LLVMContext &C, TypeID IDNumber) {
   }
 }
 
-Type *Type::getScalarType() const {
-  if (auto *VTy = dyn_cast<VectorType>(this))
-    return VTy->getElementType();
-  return const_cast<Type*>(this);
-}
-
 bool Type::isIntegerTy(unsigned Bitwidth) const {
   return isIntegerTy() && cast<IntegerType>(this)->getBitWidth() == Bitwidth;
 }