[compiler-rt] [win/asan] Add a test skeleton for function GetInstructionSize. (PR #116948)

[via llvm-commits]

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@@ -907,6 +912,11 @@ static size_t GetInstructionSize(uptr address, size_t* rel_offset = nullptr) {
   return 0;
 }
 
+// Unfortunately size_t is not known when compiling asan_allocator.cpp
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zmodem wrote:

I guess the problem with size_t is only in the header file, interception_win.h? If so, can we use SIZE_T only there, and size_t everywhere else? (Or are they not compatible?)

We could also use `unsigned` for the test function instead of `size_t`..

https://github.com/llvm/llvm-project/pull/116948