New encoding for memory instructions #253

Job	Run time
abi-dump-setup	1m 23s
Test llvm,clang,libclc / Lit Tests (ubuntu-latest)	45m 26s
Test llvm,clang,libclc / Lit Tests (windows-2019)	1m 56s
Build lldb / Lit Tests (ubuntu-latest)	21m 54s
Test llvm,clang,libclc / Lit Tests (macOS-latest)	1h 1m 50s
Test lld / Lit Tests (ubuntu-latest)	9m 16s
Build lldb / Lit Tests (windows-2019)	2m 17s
Build lldb / Lit Tests (macOS-latest)	10m 14s
Test lld / Lit Tests (windows-2019)	2m 5s
Test lld / Lit Tests (macOS-latest)	10m 33s
abi-dump (build-baseline)	31m 47s
abi-dump (build-latest)	32m 42s
abi-compare	45s
	3h 52m 8s

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