Suppress nullptr dereference warnings.

It's unclear to me if passing nullptr to NormalizeType
can eventually cause a null dereference.
Add a call to slangAssert(Context) before using Context
just to remove the warning on potential null Context.

Bug: 263274255
Test: presubmit; make tidy-frameworks-compile_subset
Change-Id: I19010454cc0ea45d66d2b436d16e6759d0c3cdcd
1 file changed