[jit] de-optionalize SourceRange context (#32880)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/32880
The PR below made it impossible to construct a SourceRange without a
context, so get rid of its optional-ness
Test Plan: Imported from OSS
Differential Revision: D19670923
Pulled By: suo
fbshipit-source-id: 05936fca2a3d5e613313ade9287b2210bc4a3ccd
