Add support for x86_64-pc-windows-gnullvm (#250) #480

Job	Run time
Rustfmt	12s
Test (x86_64-unknown-linux-gnu, stable, ubuntu-latest)	6m 19s
Test (x86_64-unknown-linux-gnu, beta, ubuntu-latest)	6m 23s
Test (x86_64-unknown-linux-gnu, nightly, ubuntu-latest)	6m 15s
Test (x86_64-apple-darwin, stable, macos-latest)	2m 49s
Test (aarch64-apple-darwin, nightly, macos-latest)	1m 57s
Test (i686-unknown-linux-gnu, stable, ubuntu-latest)	3m 28s
Test (arm-unknown-linux-gnueabi, stable, ubuntu-latest)	3m 37s
Test (aarch64-unknown-linux-gnu, stable, ubuntu-latest)	3m 45s
Test (riscv64gc-unknown-linux-gnu, stable, ubuntu-latest)	3m 41s
Test (x86_64-unknown-linux-musl, stable, ubuntu-latest)	3m 14s
Test (x86_64-pc-windows-gnu, stable, ubuntu-latest)	7m 53s
Test (i686-pc-windows-msvc, stable-i686-msvc, windows-2019)	19m 47s
Test (i686-pc-windows-msvc, stable-i686-msvc, windows-2019, yes)	19m 25s
Test (x86_64-pc-windows-msvc, stable-x86_64-msvc, windows-latest)	18m 55s
Test (x86_64-pc-windows-msvc, stable-x86_64-msvc, windows-latest, yes)	19m 43s
Test (x86_64-pc-windows-msvc, stable-x86_64-msvc, windows-latest, installed)	20m 9s
	2h 27m 32s

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