[flang] Update the regression tests to use the new driver when enabled
This patch updates most of the remaining regression tests (~400) to use
flang-new rather then f18 when FLANG_BUILD_NEW_DRIVER is set.
This allows us to share more Flang regression tests between f18 and
flang-new. A handful of tests have not been ported yet - these are
currently either failing or not supported by the new driver.
Summary of changes:
- RUN lines in tests are updated to use %flang_fc1 instead of %f18
- option spellings in tests are updated to forms accepted by both f18 and flang-new
- variables in Bash scripts are renamed (e.g. F18 --> FLANG_FC1)
The updated tests will now be run with the new driver, flang-new,
whenever it is enabled (i.e when FLANG_BUILD_NEW_DRIVER is set).
Although this patch touches many files, vast majority of the changes are
grep -IEZlr "%f18" flang/test/ | xargs -0 -l sed -i 's/%f18/%flang_fc1/g
Differential Revision: https://reviews.llvm.org/D100309