Fix clang errors blocking PCH compile and remaining Clang errors

[ruiji-shi]

Summary

Fix all Clang errors with 3 patterns below.

Pattern A — static constexpr → static const on arrays whose initializers are not constant expressions (2 sites)

Error message: error : constexpr variable 'map' must be initialized by a constant expression

Fix: Casting an integer to an unfixed enum where the result lies outside the enum's value range (e.g. (EnumType)-1 for an unsigned-underlying enum) is not a core constant expression. Demoting constexpr to const drops the strict constant-evaluation requirement; both arrays are only used at runtime, so nothing depended on their constexpr-ness during compile time.

Pattern B — disambiguate InitializeDeferredHandle<> partial specializations (1 site)

Error message: error: ambiguous partial specializations of 'InitializeDeferredHandle<void (*)(D3D10DDI_HDEVICE, const unsigned int *, D3D10DDI_HSHADER, D3D10DDI_HRTSHADER)>'

Fix: The TArgs...of the updated InitializeDeferredHandle is allowed to be empty, in which case its signature can collapse to the 4-arg form (HDEVICE, const UINT*, HSHADER, HRTSHADER) — which also matches the 1st 4-arg partial specialization InitializeDeferredHandle<void(*)(HDEVICE, TArgs, THandle, TRTHandle)> for PopulateDeferredShaderInit(m_pDDITable->pfnCreateComputeShader). Fix by adding one extra arg (TSignature) to exclude the 4-arg case from this specialization, and the 4-arg case is then unambiguously handled by the 1st specialization.

Pattern C — insert template keyword on dependent-template-name calls (30 sites)

Error message: error : expected expression

Fix: In Clang, when a dependent name is followed by < and is intended as a template-id, it must be preceded by the template keyword — otherwise the compiler parses < as the less-than operator and reports error: expected expression.

Validation

Local build for both Clang and MSVC build pass.