Indirect function calls that occur as a top-level expression cause a crash

[AndrewScheidecker]

The problem occurs here:
ret->fullType = getFunctionType(astStackHelper.getParent(), ret->operands);

astStackHelper.getParent() is null for a top-level expression, which causes getFunctionType to crash.

Instead of calling astStackHelper.getParent(), shouldn't it try to determine the return type of the functions in the specified function table?

[kripken]

Fixed, thanks for filing.

The lack of a parent implies a void return type, since asm.js forces a coercion if there is a return type (even if discarded).