AnirudhMathur12 1077e09e52 Fix crash in missing argument diagnostics for KeyPath applications ...

The compiler previously crashed when diagnosing missing arguments in KeyPathExpr (e.g., \.split(separator: ",")). This occurred because getFunctionArgApplyInfo failed to handle KeyPathExpr anchors, and CSDiagnostics.cpp blindly unwrapped the result.
This change fixes the crash by:
 - Retrieving KeyPath Overloads: Updating ConstraintSystem::getFunctionArgApplyInfo to scan the locator path for the KeyPathComponent. This allows us to retrieve the correct argument list and overload choice (function type) when available.
 - Adding Safety Check: Updating MissingArgumentsFailure::diagnoseAsError to safely check if FunctionArgApplyInfo was successfully created before accessing it. This ensures graceful failure if the solver cannot determine the overload for the malformed component.

2026-01-02 04:50:50 +05:30

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