fix: segfault on Takesnapshot when go build -race

[y1yang0]

The crash occurs because newproc1 is executed by the m0.g0 scheduling goroutine, which lacks racectx. However, contextPropagate inserted by -race forcibly adds a call to racefuncenter(), which expects racectx to be valid. Since m0.g0.racectx is 0, this leads to a crash.

One solution is to use the Go compiler's directive:

//go:norace
The //go:norace directive must be followed by a function declaration. It specifies that the function's memory accesses should be ignored by the race detector. This is most commonly used in low-level code invoked at times when it is unsafe to call into the race detector runtime.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.81%. Comparing base (d71d610) to head (466a465).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #252   +/-   ##
=======================================
  Coverage   83.81%   83.81%           
=======================================
  Files          19       19           
  Lines         791      791           
=======================================
  Hits          663      663           
  Misses        102      102           
  Partials       26       26           

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[y1yang0]

Looks good, thanks.