This updates the array initialization loop to use a do..while loop
rather than a fully serialized initialization. It also allows the
initialization of destructed objects when exception handling is not
enabled.

Array initialization when exception handling is enabled remains
unimplemented, but more precise messages are now emitted.

This change adds support for function linkage and visibility and related
attributes. Most of the test changes are generalizations to allow
'dso_local' to be accepted where we aren't specifically testing for it.
Some tests based on CIR inputs have been updated to add 'private' to
function declarations where required by newly supported interfaces.

The dso-local.c test has been updated to add specific tests for
dso_local being set correctly, and a new test, func-linkage.cpp tests
other linkage settings.

This change sets `comdat` correctly in CIR, but it is not yet applied to
functions when lowering to LLVM IR. That will be handled in a later
change.

Update `isSized` function with the upstreamed types

This change adds support for the CIRGlobalValueInterface and attributes
for visibility and comdat to GlobalOp.

The comdat attribute isn't correctly calculated yet, but it was required
for the CIRGlobalValueInterface interface. There are also some cases
where dso_local isn't set correctly, but it is better than it was before
this change. Those issues will be addressed in a future patch.

This change adds code to defer emitting declarations and tentative
definitions until they are referenced or trigger by a call to
CompleteTentativeDefinition. This is needed to avoid premature handling
of declarations and definitions that might not be referenced in the
current translation unit. It also avoids incorrectly adding an
initializer to external declarations.

This change also updates the way the insertion location for globals is
chosen so that all globals will be emitted together at the top of the
module. This makes no functional difference, but it is very useful for
writing sensible tests.

Some tests are modified in this change to reorder global variables so
that they can be checked in the order in which they will be emitted.

This adds alignment support for GlobalOp, LoadOp, and StoreOp.

Tests which failed because cir.store/cir.load now print alignment were
updated with wildcard matches, except where the alignment was relevant
to the test. Tests which check for cir.store/cir.load in cases that
don't have explicit alignment were not updated.

New tests for alignment are alignment.c, align-load.c, and
align-store.c.

We have been using the default names for global symbols to this point.
This change introduces proper name mangling for functions.

This requires introducing a CXXABI class in the CIRGenModule. Because
only target independent name mangling is handled in this patch, the
CXXABI class does not require a target-specific implementation. The
general mechanism for selecting an implementation is introduced here,
but the actual target-specific subclasses are deferred until needed.

This change adds an ArraySubscriptExpr from the function parameter with
base type as Pointer

Issue https://github.com/llvm/llvm-project/issues/130197

Follow-up patch to improve variable names in LLVM and OGCG in
https://github.com/llvm/llvm-project/pull/134536

This change adds ArraySubscriptExpr for fixed size ArrayType

Issue #130197