[NFC][Clang] Fix tests after wchar_size chang w/ 5a88dffc (#35325)
Fix CodeGenCUDA/flush-denormals.cu and CodeGenSYCL/flush-denormals.cpp
tests that broke after commit 5a88dffc which removed the wchar_size
module flag for standard targets.
The commit changed module.flags to no longer include wchar_size for
standard targets, reducing the number of module flags. Updated the
test CHECK lines to match the new module.flags pattern with fewer
elements.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
CMPLRLLVM-73948
Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>
