Fix infinite-loop ILVerify crash - #2756
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Fixes #2747 Copilot-Session: d27ee0ef-46db-423b-93dc-db64f8eae1ff
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Fixes #2747
Fold literal conditional gotos during emission so
while trueuses an unconditional back-edge instead of exposing an impossible fallthrough at the end of a non-void method. Adds runtime and ILVerify coverage for the cycle-13 failure shape.Targeted regression tests pass. The isolated full Compiler.Tests run passed 3,383 tests; 19 environment-dependent tests could not locate the separately built Gsharp.Extensions.dll and are left to the complete CI build.