Remove ternary Lvalue support in SPIR-V.

Ternaries are not assignable in GLSL/SkSL. This code should never have
been reached; no tests are affected.

Change-Id: I7d0139531062c27d7af395553e0d225247a70b48
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/369878
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
1 file changed