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The Angular compiler creates two `ts.Program`s; one for emit and one for template type-checking. The creation of the type-check program could benefit from reusing the `ts.ModuleResolutionCache` that was primed during the creation of the emit program. This requires that the compiler host implements `resolveModuleNames`, as otherwise TypeScript will setup a `ts.ModuleResolutionHost` of its own for both programs. This commit ensures that `resolveModuleNames` is always implemented, even if the originally provided compiler host does not. This is beneficial for the `ngc` binary. PR Close #39693