Commits on Oct 9, 2024

1. Switch DirectX Target to use the Itanium ABI …

   To consolidate behavior of function mangling and limit the number
   of places that ABI changes will need to be made, this switches the
   DirectX target used for HLSL to use the Itanium ABI from the
   Microsoft ABI. The Itanium ABI has greater flexibility in decisions
   regarding mangling of new types of which we have more than a few
   yet to add.
   
   This required adding a function to call all global destructors as
   the Microsoft ABI had done.
   
   This requires a few changes to tests. Most notably the mangling style
   has changed which accounts for most of the changes. In making those
   changes, I took the opportunity to harmonize some very similar tests
   for greater consistency. I also shaved off some unneeded run flags
   that had probably been copied over from one test to another.
   
   Other changes effected by using the new ABI include using smaller
   types when possible in a few instances, eliminating an unnecessary
   alloca in one instance in this-assignment.hlsl, and changing the
   order of inout parameters getting copied in and out.
   That last is a subtle change in functionality, but one where there
   was sufficient inconsistency in the past that standardizing is
   important, but the particular direction of the standardization is
   less important for the sake of existing shaders.
   
   fixes llvm#110736

   

   pow2clk committed Oct 9, 2024
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