Add special 'get' methods to create an Attribute with an alignment. Also do some random cleanup. No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173635 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/IR/Attributes.cpp b/lib/IR/Attributes.cpp
index b982b05..1b057bb 100644
--- a/lib/IR/Attributes.cpp
+++ b/lib/IR/Attributes.cpp
@@ -62,6 +62,17 @@
   return Attribute(PA);
 }
 
+Attribute Attribute::getWithAlignment(LLVMContext &Context, uint64_t Align) {
+  AttrBuilder B;
+  return get(Context, B.addAlignmentAttr(Align));
+}
+
+Attribute Attribute::getWithStackAlignment(LLVMContext &Context,
+                                           uint64_t Align) {
+  AttrBuilder B;
+  return get(Context, B.addStackAlignmentAttr(Align));
+}
+
 bool Attribute::hasAttribute(AttrKind Val) const {
   return pImpl && pImpl->hasAttribute(Val);
 }