[Bitcode] Refactor attribute group writing to avoid getSlotAttributes

Summary:
That API creates a temporary AttributeList to carry an index and a
single AttributeSet. We need to carry the index in addition to the set,
because that is how attribute groups are currently encoded.

NFC

Reviewers: pcc

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D32262

llvm-svn: 301245

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/IR/Attributes.cpp b/llvm/lib/IR/Attributes.cpp
index d690111ef21..f6deba6c04b 100644
--- a/llvm/lib/IR/Attributes.cpp
+++ b/llvm/lib/IR/Attributes.cpp
@@ -1257,6 +1257,12 @@ AttributeList AttributeList::getSlotAttributes(unsigned Slot) const {
   return pImpl->getSlotAttributes(Slot);
 }
 
+AttributeSet AttributeList::getSlotSet(unsigned Slot) const {
+  assert(pImpl && Slot < pImpl->getNumSlots() &&
+         "Slot # out of range!");
+  return pImpl->getSlotNode(Slot);
+}
+
 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
 LLVM_DUMP_METHOD void AttributeList::dump() const {
   dbgs() << "PAL[\n";