Summary:
And, btw, the tests show that performance of that is not so great:
```
Running /Users/shergin/fbsource/fbobjc/buck-out/cells/fbsource/gen/xplat/js/react-native-github/ReactCommon/fabric/core/benchmarks
Run on (12 X 2900 MHz CPU s)
CPU Caches:
L1 Data 32K (x6)
L1 Instruction 32K (x6)
L2 Unified 262K (x6)
L3 Unified 12582K (x1)
--------------------------------------------------------------------------------------------
Benchmark Time CPU Iterations
--------------------------------------------------------------------------------------------
propParsingUsingComponentDescriptor 79630 ns 77991 ns 8864
propParsingUsingComponentDescriptorWithNoSourceProps 70200 ns 69099 ns 8362
```
Which means 70ms per 1000 prop parsing processes.
Reviewed By: JoshuaGross, mdvacca
Differential Revision: D15608677
fbshipit-source-id: ed4feca489e1243adc73de4741c287256c3aaec3