[llvm-commits] [patch][pr14113] Use inreg in combination with x86_fastcallcc

[Rafael Espíndola]

If a argument to a fastcall function should be passed in registers or
not depends on the original C type, but both "int x" and "struct {int
x;}" become just an i32 llvm argument. I think the best way to solve
this is to do what we do for the regparm attribute and use inreg to
mark the arguments that should go in registers.

The attached patches implement that. Are they OK?

Cheers,
Rafael
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