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Reland of https://github.com/flutter/engine/pull/47432 Also includes: https://github.com/flutter/engine/pull/47617 https://github.com/flutter/engine/pull/47637 Fixes the performance on iOS by removing blocking on compilation of shaders. From local testing this has identical before/after numbers. Additional, ensures that we don't unecessarily specialize vertex shaders and notes this restriction in the documentation. Adds support for Specialization constants to Impeller for our usage in the engine. A motivating example has been added in the impeller markdown docs. Fixes https://github.com/flutter/flutter/issues/136210 Fixes https://github.com/flutter/flutter/issues/119357 Investigating: https://github.com/flutter/flutter/issues/138028