[SOL] Remove isSolana flag (#113) #290

Job	Run time
abi-dump-setup	1m 22s
Test llvm,clang,libclc / Lit Tests (ubuntu-latest)	46m 2s
Test lld / Lit Tests (ubuntu-latest)	9m 48s
Build lldb / Lit Tests (ubuntu-latest)	22m 7s
Test llvm,clang,libclc / Lit Tests (windows-2019)	1m 52s
Test lld / Lit Tests (windows-2019)	1m 53s
Build lldb / Lit Tests (windows-2019)	2m 5s
Test llvm,clang,libclc / Lit Tests (macOS-latest)	1h 2m 1s
Test lld / Lit Tests (macOS-latest)	10m 25s
Build lldb / Lit Tests (macOS-latest)	18m 48s
abi-dump (build-baseline)	32m 12s
abi-dump (build-latest)	32m 20s
abi-compare	46s
	4h 1m 41s

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