Update Precompute to handle tuples (#2687)

This involves replacing `Literal::makeZero` with `Literal::makeZeroes`
and `Literal::makeSingleZero` and updating `isConstantExpression` to
handle constant tuples as well. Also makes `Literals` its own struct
and adds convenience methods on it.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/passes/MemoryPacking.cpp b/src/passes/MemoryPacking.cpp
index 640207fc7..c6b8a281a 100644
--- a/src/passes/MemoryPacking.cpp
+++ b/src/passes/MemoryPacking.cpp
@@ -595,7 +595,8 @@ void MemoryPacking::createReplacements(Module* module,
 
       // Create new memory.init or memory.fill
       if (range.isZero) {
-        Expression* value = builder.makeConst(Literal::makeZero(Type::i32));
+        Expression* value =
+          builder.makeConst(Literal::makeSingleZero(Type::i32));
         appendResult(builder.makeMemoryFill(dest, value, size));
       } else {
         size_t offsetBytes = std::max(start, range.start) - range.start;