Enables shader disassembly on Windows/MSVC

[GrantComm]

Shader disassembly relies on mesa generated code (ir3-isa.c) that MSVC refused to compile because it had zero size arrays. This change checks ensures there are no zero sized arrays and adds compile checks for msvc

[wangra-google]

a general comment here: we need to add // GOOGLE: <reason for the change> when we make any change on any file in the mesa folder. The reason is that we might need to integrate the new versions from mesa in the future, it would be very difficult for integration if we do not put comments on our local changes. (This also means we need to minimize the changes in the files in the mesa folder as much as possible)

[wangra-google]

strange that i keep having following building errors after applying this PR (having this error in both Debug and Release):

[wangra-google]

strange that i keep having following building errors after applying this PR (having this error in both Debug and Release):

i tried another pc, no such error. must be something strange locally on that pc.