[Alignment][NFC] Mark IRTranslator::getMemOpAlignment deprecated

Summary:
This is patch is part of a series to introduce an Alignment type.
See this thread for context: http://lists.llvm.org/pipermail/llvm-dev/2019-July/133851.html
See this patch for the introduction of the type: https://reviews.llvm.org/D64790

Reviewers: courbet

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D77218

llvm/include/llvm/CodeGen/GlobalISel/IRTranslator.h

@@ -582,8 +582,9 @@ private:
   /// Get the alignment of the given memory operation instruction. This will
   /// either be the explicitly specified value or the ABI-required alignment for
   /// the type being accessed (according to the Module's DataLayout).
-  /// FIXME: Remove once transition to Align is over.
-  inline unsigned getMemOpAlignment(const Instruction &I) {
+  LLVM_ATTRIBUTE_DEPRECATED(
+      inline unsigned getMemOpAlignment(const Instruction &I),
+      "Use getMemOpAlign instead") {
     return getMemOpAlign(I).value();
   }