[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_DRI

[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
automatic:
```
grep -IEZlr "%f18" flang/test/ | xargs -0 -l sed -i 's/%f18/%flang_fc1/g
```

Differential Revision: https://reviews.llvm.org/D100309

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[flang][NFC] Simplify semantics test scripts

There were several different ways of handling the option to f18 to
find predefined modules:
- test_errors.sh was created by cmake substituting
FLANG_IN

[flang][NFC] Simplify semantics test scripts

There were several different ways of handling the option to f18 to
find predefined modules:
- test_errors.sh was created by cmake substituting
FLANG_INTRINSIC_MODULES_DIR into test_errors.sh.in
- some tests used the flang script which has the option built it
- some tests used %f18_with_includes which was replaced by the path
to f18 plus the -I option
- some included -I../../include/flang in their run command

To make this more consistent, change %f18 to include the
-intrinsic-module-directory option and use it everywhere, including
to replace %flang and %f18_with_includes. This requires changing all
of the invocations of the test scripts to put %f18 at the end so that
it can expand to more than one argument.

This eliminates the need to generate test_errors.sh which means we
don't need flang/test/Semantics/CMakeLists.txt or the %B substitution.
That makes the test_errors.sh command like the others, replacing
%B/test/Semantics/test_errors.sh with %S/test_errors.sh.

Also remove the OPTIONS: functionality as custom options can be included
in the RUN: command. And remove -I/../../include/flang as that is now
always included.

Differential Revision: https://reviews.llvm.org/D79634

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[Flang][test] Don't set PATH in flang/test/Semantics/common.sh

Currently, many `Flang :: Semantics` tests FAIL on Solaris. The failure
mode is always the same:

actual at 67: Name in ALLOCATE sta

[Flang][test] Don't set PATH in flang/test/Semantics/common.sh

Currently, many `Flang :: Semantics` tests FAIL on Solaris. The failure
mode is always the same:

actual at 67: Name in ALLOCATE statement must be a variable name
expect at 67: ERROR: Name in ALLOCATE statement must be a variable name

It turns out the issue is twofold here:

- The awk script embedded in `flang/test/Semantics/common.sh` uses a string
value for `FS`, which isn't supported by traditional awk as documented in
the GNU autoconf manual.

- Even though /usr/gnu/bin (with gawk installed as awk) is in my build
environment's `PATH`, still /bin/awk is used

Although the proper fix would probably be to avoid the unportability, it's
easy to work around it for now. `common.sh` above is the only script in
the whole tree that for unknown reasons overrides `PATH` to
`/usr/bin:/bin`, unnecessarily creating this mess in the first place. Just
removing that setting easily avoids the issue.

Tested on `amd64-pc-solaris2.11` and `sparcv9-sun-solaris2.11`.

Differential Revision: https://reviews.llvm.org/D78550

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[flang] Added CMakeLists changes, moved config and made test scripts compatible.

All Fortran tests are now run in lit, except Preprocessing tests flang-compiler/f18#1052
Preprocessing tests are a se

[flang] Added CMakeLists changes, moved config and made test scripts compatible.

All Fortran tests are now run in lit, except Preprocessing tests flang-compiler/f18#1052
Preprocessing tests are a separate kind of test, so will be sorted out
later.

Original-commit: flang-compiler/f18@3f99d35f3d4f57f704fd91a0d6ba8af308e900b3
Reviewed-on: https://github.com/flang-compiler/f18/pull/1027

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[flang] [LLVMify F18] Compiler module folders should have capitalised names (flang-compiler/f18#980)

This patch renames the modules in f18 to use a capital letter in the
module name

Signed-off-b

[flang] [LLVMify F18] Compiler module folders should have capitalised names (flang-compiler/f18#980)

This patch renames the modules in f18 to use a capital letter in the
module name

Signed-off-by: Caroline Concatto <caroline.concatto@arm.com>

Original-commit: flang-compiler/f18@d2eb7a1c443d1539ef12b6f027074a0eb15b1ea0
Reviewed-on: https://github.com/flang-compiler/f18/pull/980

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