[clr-interpreter] Followon changes from PR #116990

[davidwrighton]

• use static_asserts where possible
• remove the mess of casts and temp variables around helper function opcodes
• Remove the DO_GENERIC_LOOKUP macro since it wasn't doing much of use anymore
• Use the simdhash apis a little better

[Copilot]

Pull Request Overview

This PR makes several follow-on improvements to the interpreter-related code by reducing cast and temporary variable usage, replacing the DO_GENERIC_LOOKUP macro with inline calls to DoGenericLookup, and improving the use of simdhash APIs while enhancing compile‐time assertions.

• Remove unnecessary casts and temp variables in helper function calls
• Replace DO_GENERIC_LOOKUP macro with explicit calls to DoGenericLookup
• Update static assertions to use static_assert_no_msg and minor brace/indentation cleanups

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/native/containers/dn-simdhash-specialization-declarations.h	Added comments clarifying that the result parameter is optional
src/coreclr/vm/interpexec.cpp	Updated helper typedef names, replaced macro usage with inline DoGenericLookup calls, and adjusted helper call invocations
src/coreclr/interpreter/compiler.h	Replaced runtime asserts with static_assert_no_msg and modified braces to improve code clarity

Comments suppressed due to low confidence (1)

src/coreclr/vm/interpexec.cpp:1771

• Ensure that the revised generic lookup logic in InterpExecMethod—especially the inline DoGenericLookup invocations—is thoroughly exercised by unit tests to cover all branch variations.

                    MethodTable *pMTNewObj = (MethodTable*)DoGenericLookup(LOCAL_VAR(ip[3], void*), pLookup);