[Alignment][NFC] Remove LogAlignment functions

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: arsenm, sdardis, nemanjai, jvesely, nhaehnle, hiraditya, kbarton, jrtc27, MaskRay, atanasyan, jsji, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67620

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@372231 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/MachineBasicBlock.cpp

@@ -326,9 +326,9 @@ void MachineBasicBlock::print(raw_ostream &OS, ModuleSlotTracker &MST,
     OS << "landing-pad";
     HasAttributes = true;
   }
-  if (getLogAlignment()) {
+  if (getAlignment() > 1) {
     OS << (HasAttributes ? ", " : " (");
-    OS << "align " << getLogAlignment();
+    OS << "align " << Log2(getAlignment());
     HasAttributes = true;
   }
   if (HasAttributes)