[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/AMDGPU/opt-sgpr-to-vgpr-copy.mir b/llvm/test/CodeGen/AMDGPU/opt-sgpr-to-vgpr-copy.mir
index d402ca8..3af2f04 100644
--- a/llvm/test/CodeGen/AMDGPU/opt-sgpr-to-vgpr-copy.mir
+++ b/llvm/test/CodeGen/AMDGPU/opt-sgpr-to-vgpr-copy.mir
@@ -57,7 +57,7 @@
 ...
 ---
 name:            const_to_sgpr
-alignment:       0
+alignment:       1
 exposesReturnsTwice: false
 legalized:       false
 regBankSelected: false
@@ -146,7 +146,7 @@
 ...
 ---
 name:            const_to_sgpr_multiple_use
-alignment:       0
+alignment:       1
 exposesReturnsTwice: false
 legalized:       false
 regBankSelected: false
@@ -252,7 +252,7 @@
 ...
 ---
 name:            const_to_sgpr_subreg
-alignment:       0
+alignment:       1
 exposesReturnsTwice: false
 legalized:       false
 regBankSelected: false