[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

llvm-svn: 372231
diff --git a/llvm/lib/Target/ARM/ARMBasicBlockInfo.cpp b/llvm/lib/Target/ARM/ARMBasicBlockInfo.cpp
index a8bdefa..4bf32be 100644
--- a/llvm/lib/Target/ARM/ARMBasicBlockInfo.cpp
+++ b/llvm/lib/Target/ARM/ARMBasicBlockInfo.cpp
@@ -47,7 +47,7 @@
   BasicBlockInfo &BBI = BBInfo[MBB->getNumber()];
   BBI.Size = 0;
   BBI.Unalign = 0;
-  BBI.PostAlign = 0;
+  BBI.PostAlign = llvm::Align::None();
 
   for (MachineInstr &I : *MBB) {
     BBI.Size += TII->getInstSizeInBytes(I);
@@ -62,7 +62,7 @@
 
   // tBR_JTr contains a .align 2 directive.
   if (!MBB->empty() && MBB->back().getOpcode() == ARM::tBR_JTr) {
-    BBI.PostAlign = 2;
+    BBI.PostAlign = llvm::Align(4);
     MBB->getParent()->ensureAlignment(llvm::Align(4));
   }
 }
@@ -126,9 +126,9 @@
   for(unsigned i = BBNum + 1, e = MF.getNumBlockIDs(); i < e; ++i) {
     // Get the offset and known bits at the end of the layout predecessor.
     // Include the alignment of the current block.
-    unsigned LogAlign = MF.getBlockNumbered(i)->getLogAlignment();
-    unsigned Offset = BBInfo[i - 1].postOffset(LogAlign);
-    unsigned KnownBits = BBInfo[i - 1].postKnownBits(LogAlign);
+    const llvm::Align Align = MF.getBlockNumbered(i)->getAlignment();
+    const unsigned Offset = BBInfo[i - 1].postOffset(Align);
+    const unsigned KnownBits = BBInfo[i - 1].postKnownBits(Align);
 
     // This is where block i begins.  Stop if the offset is already correct,
     // and we have updated 2 blocks.  This is the maximum number of blocks