Remove bpf load builtins #248

Job	Run time
abi-dump-setup	58s
Build lldb / Lit Tests (ubuntu-latest)	1h 58m 59s
Test llvm,clang,libclc / Lit Tests (ubuntu-latest)	2h 47m 32s
Build lldb / Lit Tests (windows-2019)	1m 23s
Test lld / Lit Tests (ubuntu-latest)	1h 2m 10s
Test llvm,clang,libclc / Lit Tests (windows-2019)	1m 56s
Build lldb / Lit Tests (macOS-latest)	1h 4m 56s
Test lld / Lit Tests (windows-2019)	1m 55s
Test llvm,clang,libclc / Lit Tests (macOS-latest)	2h 2m 1s
Test lld / Lit Tests (macOS-latest)	43m 10s
abi-dump (build-baseline)	31m 9s
abi-dump (build-latest)	30m 34s
abi-compare	28s
	10h 47m 11s

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