[HLSL] Support noinline attribute to prevent automatic inlining

[pow2clk]

#89282 will result in inlining all non-entry functions. That isn't quite right as functions with the noinline attribute shouldn't be.

Deliverables

Fully document how noinline should work in the context of passed resources and different qualifiers including the notoriously buggy globallycoherent and precise qualifiers. There is a chance that these will depend on further outside specification of how these qualifiers are expected to work.

Support for noinline in HLSL and the resulting functions remaining as separate calls in the output DXIL or SPIR-V.

Acceptance Criteria

A large swath of tests that verify that an assortment of user functions with different parameters, return values, semantics and other qualifiers correctly retain those features when they are called independently.