[compiler-rt] Fix broken unittest related to 64-bit print format

Summary:
The printf is not working correctly on 64-bit MSVC.

The portable way to print "size_t" is to use "%zx" (size_t in hexa).

Reviewers: rnk

Subscribers: kubabrecka, llvm-commits, wang0109, chrisha

Differential Revision: https://reviews.llvm.org/D22588

llvm-svn: 276179
GitOrigin-RevId: 0e4cf2f6b3e54f29d6eaf5b49b2e3235881a8ece
2 files changed