[wasm] asm.js - Check stdlib.NaN is valid, prepare for the rest.

src/asmjs/asm-typer.cc

Index: src/asmjs/asm-typer.cc
diff --git a/src/asmjs/asm-typer.cc b/src/asmjs/asm-typer.cc
index bdd657f8f1bf73ade9e0b7014c90367a38bf5a6b..88879ab84d4a190c6954bcecdf41e1543d521e1d 100644
--- a/src/asmjs/asm-typer.cc
+++ b/src/asmjs/asm-typer.cc
@@ -428,7 +428,9 @@ AsmTyper::StandardMember AsmTyper::VariableAsStandardMember(Variable* var) {
   if (var_info == nullptr) {
     return kNone;
   }
-  return var_info->standard_member();
+  StandardMember member = var_info->standard_member();
+  stdlib_uses_.insert(member);
+  return member;
 }
 
 bool AsmTyper::Validate() {