[interp] Fold "ldstr".Length to a constant #20523
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A similar optimization for RyuJIT was quite profitable judging by the jit-diff: dotnet/runtime#1378 Example: ```csharp static int Test() { return "hello".Length; } ``` Current `MONO_VERBOSE_METHOD=Test` output: ``` IR_0000: ldstr 0 IR_0002: strlen IR_0003: ret ``` New output: ``` IR_0000: ldc.i4.5 IR_0001: ret ```
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!! This PR is a copy of dotnet/runtime#43945, please do not edit or review it in this repo !!
Do not automatically approve this PR:
* Consider how the changes affect configurations in this repo,
* Check effects on files that are not mirrored,
* Identify test cases that may be needed in this repo.
!! Merge the PR only after the original PR is merged !!
A similar optimization for RyuJIT was quite profitable judging by the jit-diff: dotnet/runtime#1378
Example:
Current
MONO_VERBOSE_METHOD=Testoutput:New output: