Add MacBook Pro (15-inch, 2018, CTO) for Xcode 10

[preco21]

Tested using Xcode 10.2.1:

System information

macOS Mojave
10.14.5 (18F203)

MacBook Pro (15-inch, 2018, CTO)

Processor/
2.9 GHz Intel Core i9

Memory/
32 GB 2400 MHz DDR4

Graphics/
Radeon Pro Vega 20 4 GB
Intel UHD Graphics 630 1536 MB

Storage/
1 TB

Timing with simulator launching duration

full build: 0:43
incremental build: 0:06

Timing without simulator launching duration

full build: 0:23/0:24/0:25 (±0.6s, 0:24 average)
incremental build: 0:03/0:03/0:03 (±0.3s, 0:03 average)

[ashfurrow]

Awesome, thanks!