IR: Fix ConstantArray::replaceUsesOfWithOnConstant()

Previously, `ConstantArray::replaceUsesOfWithOnConstant()` neglected to
check whether it becomes a `ConstantDataArray`.  Call
`ConstantArray::getImpl()` to check for that.

llvm-svn: 215965

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/IR/Constants.cpp b/llvm/lib/IR/Constants.cpp
index f0429ede820..c2c3c40df1c 100644
--- a/llvm/lib/IR/Constants.cpp
+++ b/llvm/lib/IR/Constants.cpp
@@ -2701,6 +2701,12 @@ void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
     return;
   }
 
+  // Check for any other type of constant-folding.
+  if (Constant *C = getImpl(getType(), Values)) {
+    replaceUsesOfWithOnConstantImpl(C);
+    return;
+  }
+
   // Check to see if we have this array type already.
   LLVMContextImpl::ArrayConstantsTy::LookupKey Lookup(
     cast<ArrayType>(getType()), makeArrayRef(Values));