[LLVM][NFC] Removing unused functions

[gchatelet]

Summary

Removes a not so useful function from DataLayout and cleans up Support/MathExtras.h

llvm/include/llvm/IR/DataLayout.h

public:
   unsigned getABIIntegerTypeAlignment(unsigned BitWidth) const;
 
   /// Returns the preferred stack/global alignment for the specified
   /// type.
   ///
   /// This is always at least as good as the ABI alignment.
   unsigned getPrefTypeAlignment(Type *Ty) const;
 
-  /// Returns the preferred alignment for the specified type, returned as
-  /// log2 of the value (a shift amount).
-  unsigned getPreferredTypeAlignmentShift(Type *Ty) const;
-
   /// Returns an integer type with size at least as big as that of a
   /// pointer in the given address space.
   IntegerType *getIntPtrType(LLVMContext &C, unsigned AddressSpace = 0) const;
 
   /// Returns an integer (vector of integer) type with size at least as
   /// big as that of a pointer of the given pointer (vector of pointer) type.
   Type *getIntPtrType(Type *) const;
 

llvm/include/llvm/Support/MathExtras.h

template <uint64_t Align> constexpr inline uint64_t alignTo(uint64_t Value) {
   return (Value + Align - 1) / Align * Align;
 }
 
 /// Returns the integer ceil(Numerator / Denominator).
 inline uint64_t divideCeil(uint64_t Numerator, uint64_t Denominator) {
   return alignTo(Numerator, Denominator) / Denominator;
 }
 
-/// \c alignTo for contexts where a constant expression is required.
-/// \sa alignTo
-///
-/// \todo FIXME: remove when \c constexpr becomes really \c constexpr
-template <uint64_t Align>
-struct AlignTo {
-  static_assert(Align != 0u, "Align must be non-zero");
-  template <uint64_t Value>
-  struct from_value {
-    static const uint64_t value = (Value + Align - 1) / Align * Align;
-  };
-};
-
 /// Returns the largest uint64_t less than or equal to \p Value and is
 /// \p Skew mod \p Align. \p Align must be non-zero
 inline uint64_t alignDown(uint64_t Value, uint64_t Align, uint64_t Skew = 0) {
   assert(Align != 0u && "Align can't be 0.");
   Skew %= Align;
   return (Value - Skew) / Align * Align + Skew;
 }
 

llvm/lib/IR/DataLayout.cpp

 unsigned DataLayout::getABIIntegerTypeAlignment(unsigned BitWidth) const {
   return getAlignmentInfo(INTEGER_ALIGN, BitWidth, true, nullptr);
 }
 
 unsigned DataLayout::getPrefTypeAlignment(Type *Ty) const {
   return getAlignment(Ty, false);
 }
 
-unsigned DataLayout::getPreferredTypeAlignmentShift(Type *Ty) const {
-  unsigned Align = getPrefTypeAlignment(Ty);
-  assert(!(Align & (Align-1)) && "Alignment is not a power of two!");
-  return Log2_32(Align);
-}
-
 IntegerType *DataLayout::getIntPtrType(LLVMContext &C,
                                        unsigned AddressSpace) const {
   return IntegerType::get(C, getIndexSizeInBits(AddressSpace));
 }
 
 Type *DataLayout::getIntPtrType(Type *Ty) const {
   assert(Ty->isPtrOrPtrVectorTy() &&
          "Expected a pointer or pointer vector type.");

llvm/lib/Target/XCore/XCoreAsmPrinter.cpp

if (!GV->hasInitializer() ||
       EmitSpecialLLVMGlobal(GV))
     return;
 
   const DataLayout &DL = getDataLayout();
   OutStreamer->SwitchSection(getObjFileLowering().SectionForGlobal(GV, TM));
 
   MCSymbol *GVSym = getSymbol(GV);
   const Constant *C = GV->getInitializer();
-  unsigned Align = (unsigned)DL.getPreferredTypeAlignmentShift(C->getType());
+  unsigned Align = Log2_32(DL.getPrefTypeAlignment(C->getType()));
 
   // Mark the start of the global
   getTargetStreamer().emitCCTopData(GVSym->getName());
 
   switch (GV->getLinkage()) {
   case GlobalValue::AppendingLinkage:
     report_fatal_error("AppendingLinkage is not supported by this target!");
   case GlobalValue::LinkOnceAnyLinkage: