Various fixes for generics

[josesimoes]

Description

• Fix handling of generic types and instances in several locations.
• Fix access to MethodSpec_Index.
• Add missing handling of MethodSpec in ldtoken instruction.
• Fix field iteration in NewGenericInstanceObject.

Motivation and Context

How Has This Been Tested?

• Tested against Merge generics support in mscorlib CoreLibrary#245.
• Tested with MDP test projects.

Screenshots

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue with code or algorithm)
• New feature (non-breaking change which adds functionality to code)
• Breaking change (fix or feature that would cause existing functionality to change)
• Config and build (change in the configuration and build system, has no impact on code or features)
• Dev Containers (changes related with Dev Containers, has no impact on code or features)
• Dependencies/declarations (update dependencies or assembly declarations and changes associated, has no impact on code or features)
• Documentation (changes or updates in the documentation, has no impact on code or features)

Checklist

• My code follows the code style of this project (only if there are changes in source code).
• My changes require an update to the documentation (there are changes that require the docs website to be updated).
• I have updated the documentation accordingly (the changes require an update on the docs in this repo).
• I have read the CONTRIBUTING document.
• I have tested everything locally and all new and existing tests passed (only if there are changes in source code).

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