Add accessor for the LLVMContext.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174824 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/IR/Attributes.cpp b/lib/IR/Attributes.cpp
index 99fafae..04e95ef 100644
--- a/lib/IR/Attributes.cpp
+++ b/lib/IR/Attributes.cpp
@@ -709,6 +709,10 @@
 // AttributeSet Accessor Methods
 //===----------------------------------------------------------------------===//
 
+LLVMContext &AttributeSet::getContext() const {
+  return pImpl->getContext();
+}
+
 AttributeSet AttributeSet::getParamAttributes(unsigned Idx) const {
   return pImpl && hasAttributes(Idx) ?
     AttributeSet::get(pImpl->getContext(),