[TargetLibraryInfo] Fix signature recognition of some lib functions.

[vaivaswatha]

Summary

Some library functions such as free, fseek, feof etc have been marked
as having 0 arguments. This is incorrect. Fix it.

[mcrosier]

Please add a test case that covers all of the modified library functions.

[vaivaswatha]

This is already fixed on trunk.

lib/Analysis/TargetLibraryInfo.cpp

bool TargetLibraryInfoImpl::isValidProtoForLibFunc(const FunctionType &FTy,
   case LibFunc::ftello:
   case LibFunc::fileno:
   case LibFunc::fflush:
   case LibFunc::fclose:
   case LibFunc::fsetpos:
   case LibFunc::flockfile:
   case LibFunc::funlockfile:
   case LibFunc::ftrylockfile:
-    return (NumParams == 0 && FTy.getParamType(0)->isPointerTy());
   case LibFunc::ferror:
     return (NumParams == 1 && FTy.getParamType(0)->isPointerTy());
   case LibFunc::fputc:
   case LibFunc::fstat:
   case LibFunc::frexp:
   case LibFunc::frexpf:
   case LibFunc::frexpl:
   case LibFunc::fstatvfs: