[Fuzzing X64] [Copilot] Fix Base64.DecodeFromUtf8 consuming whitespace in pa ...

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Job completed in 37 minutes 1 second (remote runner delay: 53 seconds).

Using arguments: fuzz Base64 -helix -queue windows.amd64.vs2022.pre.open -NoPRLink
Main commit: dotnet/runtime@8fafcb3
PR commit: dotnet/runtime@49469ab

ERROR: System.Exception: prepare-fuzzer.bat  failed with exit code -532462766
   at Runner.JobBase.RunProcessAsync(String fileName, String arguments, List`1 output, String logPrefix, String workDir, Boolean checkExitCode, Func`2 processLogs, Boolean suppressOutputLogs, Boolean suppressStartingLog, ProcessPriorityClass priority, List`1 envVars, CancellationToken cancellationToken) in C:\h\w\B4C709FE\w\B6FC09B2\e\runtime-utils\Runner\JobBase.cs:line 472
   at Runner.Jobs.FuzzLibrariesJob.BuildRuntimeAndPrepareFuzzerAsync() in C:\h\w\B4C709FE\w\B6FC09B2\e\runtime-utils\Runner\Jobs\FuzzLibrariesJob.cs:line 77
   at Runner.Jobs.FuzzLibrariesJob.RunJobCoreAsync() in C:\h\w\B4C709FE\w\B6FC09B2\e\runtime-utils\Runner\Jobs\FuzzLibrariesJob.cs:line 34
   at Runner.JobBase.RunJobAsync() in C:\h\w\B4C709FE\w\B6FC09B2\e\runtime-utils\Runner\JobBase.cs:line 164

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