[llvm][NFC] Remove CallingConvLower deprecated alignment functions

llvm/include/llvm/CodeGen/CallingConvLower.h

unsigned AllocateStack(unsigned Size, Align Alignment) {
     StackOffset = alignTo(StackOffset, Alignment);
     unsigned Result = StackOffset;
     StackOffset += Size;
     MaxStackArgAlign = std::max(Alignment, MaxStackArgAlign);
     ensureMaxAlignment(Alignment);
     return Result;
   }
 
-  // FIXME: Deprecate this function when transition to Align is over.
-  LLVM_ATTRIBUTE_DEPRECATED(unsigned AllocateStack(unsigned Size,
-                                                   unsigned Alignment),
-                            "Use the version that takes Align instead.") {
-    return AllocateStack(Size, Align(Alignment));
-  }
-
   void ensureMaxAlignment(Align Alignment);
 
-  /// Version of AllocateStack with extra register to be shadowed.
-  LLVM_ATTRIBUTE_DEPRECATED(unsigned AllocateStack(unsigned Size,
-                                                   unsigned Alignment,
-                                                   unsigned ShadowReg),
-                            "Use the version that takes Align instead.") {
-    MarkAllocated(ShadowReg);
-    return AllocateStack(Size, Align(Alignment));
-  }
-
   /// Version of AllocateStack with list of extra registers to be shadowed.
   /// Note that, unlike AllocateReg, this shadows ALL of the shadow registers.
   unsigned AllocateStack(unsigned Size, Align Alignment,
                          ArrayRef<MCPhysReg> ShadowRegs) {
     for (unsigned i = 0; i < ShadowRegs.size(); ++i)
       MarkAllocated(ShadowRegs[i]);
     return AllocateStack(Size, Alignment);
   }