Subzero, Wasm: Link and run torture tests; bug fixes.

src/IceCfg.cpp

Index: src/IceCfg.cpp
diff --git a/src/IceCfg.cpp b/src/IceCfg.cpp
index bb738a78c7d541b152ada34ace53659b65f3feb1..db2904d1f724ef4bb595487a122fe845a6024ccc 100644
--- a/src/IceCfg.cpp
+++ b/src/IceCfg.cpp
@@ -261,8 +261,9 @@ void Cfg::fixPhiNodes() {
 
 void Cfg::computeInOutEdges() {
   // Compute the out-edges.
-  for (CfgNode *Node : Nodes)
+  for (CfgNode *Node : Nodes) {
     Node->computeSuccessors();
+  }
 
   // Prune any unreachable nodes before computing in-edges.
   SizeT NumNodes = getNumNodes();
@@ -599,6 +600,7 @@ void Cfg::processAllocas(bool SortAndCombine) {
   TimerMarker _(TimerStack::TT_alloca, this);
   const uint32_t StackAlignment = getTarget()->getStackAlignment();
   CfgNode *EntryNode = getEntryNode();
+  assert(EntryNode);
   // LLVM enforces power of 2 alignment.
   assert(llvm::isPowerOf2_32(StackAlignment));
   // Determine if there are large alignment allocations in the entry block or