Record which asm.js stdlib members are used and add a check that NaN is actually correctly set. Other stdlib members to be added in a later change.

Also add a stdlib argument to Wasm.instantiateModuleFromAsm, in preparation for that function to be replaced by normal asm.js instantiation.

BUG= https://bugs.chromium.org/p/v8/issues/detail?id=4203
LOG=N
R=jpp@chromium.org,titzer@chromium.org

Review-Url: https://codereview.chromium.org/2251433002
Cr-Commit-Position: refs/heads/master@{#38760}