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.
This change upstreams the code to support emitting inline C++ function
definitions, including the ASTConsumer handler for inline definitions
and the code to load the 'this' pointer.
This necessitates introducing the Itanium CXXABI class. No other CXXABI
subclasses are supported at this time. The Itanium CXXABI is used for
AppleARM64, which will require its own handler for a few special cases
(such as array cookies) later.
This change adds the support needed to handle a C++ member function
call, including arranging the function type with an argument added for
the 'this' parameter. It was necessary to introduce the class to handle
the CXXABI, but at this time no target-specific subclasses have been
added.
