[runtime] Emit the necessary left shift anding in the LambdaCompiler

[runtime] Emit the necessary left shift anding in the LambdaCompiler

We were observing dtest-006.exe test failing on armhf. This test
checks that a right shift with a negative shift amount and a
dynamic base is shifted by the right amount.

We were failing it because we were excluding the step that we
do in regular code generation, which is to do a binary and of the shift
amount so it behaves like we are shifting by the original shift
amount modulo 32. The C# spec defines left shift like so.

This commit adds that to the LambdaCompiler.