[LazyValueInfo] Make LVILatticeVal intersect method take arguments by reference so we don't copy ConstantRanges unless we need to.
llvm-svn: 304990
diff --git a/llvm/lib/Analysis/LazyValueInfo.cpp b/llvm/lib/Analysis/LazyValueInfo.cpp
index a673b6d..87e7f9b 100644
--- a/llvm/lib/Analysis/LazyValueInfo.cpp
+++ b/llvm/lib/Analysis/LazyValueInfo.cpp
@@ -302,7 +302,7 @@
/// contradictory. If this happens, we return some valid lattice value so as
/// not confuse the rest of LVI. Ideally, we'd always return Undefined, but
/// we do not make this guarantee. TODO: This would be a useful enhancement.
-static LVILatticeVal intersect(LVILatticeVal A, LVILatticeVal B) {
+static LVILatticeVal intersect(const LVILatticeVal &A, const LVILatticeVal &B) {
// Undefined is the strongest state. It means the value is known to be along
// an unreachable path.
if (A.isUndefined())