[SOL] Use R10 as the stack pointer #301

Job	Run time
abi-dump-setup	1m 22s
Build lldb / Lit Tests (ubuntu-22.04)	21m 30s
Test lld / Lit Tests (ubuntu-22.04)	9m 14s
Build lldb / Lit Tests (windows-2019)	1m 44s
Test lld / Lit Tests (windows-2019)	2m 16s
Build lldb / Lit Tests (macOS-latest)	17m 17s
Test lld / Lit Tests (macOS-latest)	8m 11s
Test llvm,clang,libclc / Lit Tests (ubuntu-22.04)	45m 5s
Test llvm,clang,libclc / Lit Tests (windows-2019)	2m 22s
Test llvm,clang,libclc / Lit Tests (macOS-latest)	1h 3m 27s
abi-dump (build-baseline)	32m 56s
abi-dump (build-latest)	33m 7s
abi-compare	31s
	3h 59m 2s

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