[Alignment] Use llvm::Align in MachineFunction and TargetLowering - fixes mir parsing

Summary:
This catches malformed mir files which specify alignment as log2 instead of pow2.
See https://reviews.llvm.org/D65945 for reference,

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: MatzeB, qcolombet, dschuff, arsenm, sdardis, nemanjai, jvesely, nhaehnle, hiraditya, kbarton, asb, rbar, johnrusso, simoncook, apazos, sabuasal, niosHD, jrtc27, MaskRay, zzheng, edward-jones, atanasyan, rogfer01, MartinMosbeck, brucehoult, the_o, PkmX, jocewei, jsji, Petar.Avramovic, asbirlea, s.egerton, pzheng, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67433

llvm-svn: 371608
diff --git a/llvm/test/CodeGen/RISCV/select-optimize-multiple.mir b/llvm/test/CodeGen/RISCV/select-optimize-multiple.mir
index f3a5f40..d937583 100644
--- a/llvm/test/CodeGen/RISCV/select-optimize-multiple.mir
+++ b/llvm/test/CodeGen/RISCV/select-optimize-multiple.mir
@@ -20,7 +20,7 @@
 # in the middle. Because the non-select depends on the result of a previous
 # select, we cannot optimize the sequence to share control-flow.
 name:            cmov_interleaved_bad
-alignment:       2
+alignment:       4
 tracksRegLiveness: true
 registers:
   - { id: 0, class: gpr }
@@ -106,7 +106,7 @@
 # the tail basic block, while debug info associated with non-selects is left
 # in the head basic block.
 name:            cmov_interleaved_debug_value
-alignment:       2
+alignment:       4
 tracksRegLiveness: true
 registers:
   - { id: 0, class: gpr }