[Torque]: add assert(), unreachable and debug statements
- In debug builds, 'assert(<expr>)' evaluates and aborts execution if the provided Torque expression is false at runtime. assert(<expr>) supports the same set of expressions protocols as Toruqe's if statement, i.e. both bool values and BranchIf- style tests. Upon failure, the assertion prints the Torque source code of the failed expression, not the generated CSA code. - 'unreachable' calls CSA's Unreachable() and signals to Torque that code execution cannot continue (i.e. its statement returns the 'never' type). In debug builds, the line number and position of the statement are printed before breaking. - 'debug' calls CSA's DebugBreak(). In debug builds, the line number and position of the 'debug' are printed before breaking. Change-Id: I4efd052536bb402c097a0d5f7be56e154b5b3676 Reviewed-on: https://chromium-review.googlesource.com/1042570 Commit-Queue: Daniel Clifford <danno@chromium.org> Reviewed-by: Jakob Gruber <jgruber@chromium.org> Cr-Commit-Position: refs/heads/master@{#52984}
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