Changes

[flang] Fix crash in folding (#48437)

Elemental intrinsic function folding was not taking the lower
bounds of constant array arguments into account; these lower bounds
can be distinct from 1 when named constants appear as arguments.

LLVM bugzilla #48437.

Differential Revision: https://reviews.llvm.org/D93321

[CMake] Avoid __FakeVCSRevision.h with no git repository

Set the return variable to "" in find_first_existing_vc_file to
say that there is a repository, but no file to depend on. This works
transparently for all other callers that handle undefinedness and
equality to an empty string the same way.

Use the knowledge to avoid depending on __FakeVCSRevision.h if there
is no git repository at all (for example when building a release) as
there is no point in regenerating an empty VCSRevision.h.

Differential Revision: https://reviews.llvm.org/D92718

[libomptarget][nfc] Replace static const with enum

[libomptarget][nfc] Replace static const with enum

Semantically identical. Replaces 0xff... with ~0 to spare counting the f.
Has the advantage that the compiler doesn't need to prove the 4/8 byte
value dead before discarding it, and sidesteps the compilation question
associated with what static means for a single source language.

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D93328

[jenkins] Fix exceptions raised by urllib.request