Adding "discard" after "break" in WebGL (ANGLE) shader causes wrong image to be rendered

[afd]

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[Shaders, screenshots, error log, etc.] [ZIP]

Reported to Intel here: https://software.intel.com/en-us/forums/developing-games-and-graphics-on-intel/topic/703691

WebGL links for easy reproduction:

• Recipient
• Variant

The variant has a "discard" statement after a "break" statement. Because the "discard" statement is unreachable code, this should have no effect on computation.

Recipient:

Variant:

[afd]

I get this issue with Edge, which doesn't use ANGLE.