CheckedCRewriter unit tests fail after CConv changes

[secure-sw-dev-bot]

This issue was copied from checkedc/checkedc-clang#851

---

After checkedc/checkedc-clang#837 merged we see the following three unit tests failing intermittently only on Windows:

- test/CheckedCRewriter/global.c
- test/CheckedCRewriter/simple_locals.c
- test/CheckedCRewriter/basic_checks.c

At least test/CheckedCRewriter/global.c seems to fail always when run manually on Windows.

$ "cconv-standalone" "clang\test\CheckedCRewriter\global.c" "--"
# command stderr:
Assertion failed: getPiece(StartPiece).size() > NumBytes, file clang\lib\Rewrite\RewriteRope.cpp, line 380

In order to unblock our failing ADO builds we need to disable the above three tests. We can enable them when we have these fixed.

[secure-sw-dev-bot]

Comment from @mgrang:

PR to disable tests: checkedc/checkedc-clang#854

[secure-sw-dev-bot]

Comment from @mgrang:

I see that these tests have been enabled by the 3C team and they are passing. I will go ahead and close this bug as it is no longer relevant.