[WebAssembly] Remove MachineFrameInfo arg from checking functions (NFC)

Summary:
There are several functions in the form of `has***` or `needs***` in
`WebAssemblyFrameLowering` and its `MachineFrameInfo` argument can be
obtained from `MachineFunction` so it is not necessarily has to be
passed from a caller. Also, it is more in line with other overriden
fuctions like `hasBP` or `hasReservedCallFrame`, which also take only
`MachineFunction` argument.

Reviewers: dschuff

Subscribers: sbc100, sunfish, llvm-commits

Differential Revision: https://reviews.llvm.org/D51116

llvm-svn: 340438