Under HLSL 202x+ move assignment can occur and when targeting `this`
move assignment was generating some really odd errors. This corrects the
errors by properly generating the `this` object reference for HLSL and
always treating it as a reference.
This mirrors the implementation added eariler for copy assignment, and
extends the test case to cover both move and copy assignment under HLSL
202x+.
Previously, functions named "main" got the NoRecurse attribute
consistent with the behavior of C++, which HLSL largely follows.
However, standard recursion is not allowed in HLSL, so all functions
should really have this attribute. This doesn't prevent recursion, but
rather signals that these functions aren't expected to recurse.
Practically, this was done so that entry point functions named "main"
would have all have the same attributes as otherwise identical entry
points with other names.
This required small changes to the this assignment tests because they no
longer generate so many attribute sets since more of them match.
related to #105244
but done to simplify testing for #89806
Generate nuw GEPs for struct member accesses, as inbounds + non-negative
implies nuw.
Regression tests are updated using update scripts where possible, and by
find + replace where not.
This change makes `this` a reference instead of a pointer in
HLSL. HLSL does not have the `->` operator, and accesses through `this`
are with the `.` syntax.
Tests were added and altered to make sure
the AST accurately reflects the types.
Reviewed By: aaron.ballman
Differential Revision: https://reviews.llvm.org/D135721
