Reduce rebuilds when running buildbot_incremental presets in succession

[edymtt]

We have some configurations in which we run a preset that only builds the compiler, and then a few ones to tests such binary, e.g.

buildbot_incremental,tools=RA,stdlib=RD,build
buildbot_incremental,tools=RA,stdlib=RD,test=macOS,type=device
buildbot_incremental,tools=RA,stdlib=RD,test=iOS,type=simulator
buildbot_incremental,tools=RA,stdlib=RD,test=watchOS,type=simulator

Contrary to the other presets, in the first preset we did not specify "--lit-args" since it is not necessary -- however that plays a part in the configuration of compiler-rt, causing an unwanted rebuild when that parameter is specified in the following preset.

Addresses rdar://116922016

[edymtt]

@swift-ci please test

[edymtt]

@swift-ci please build toolchain

[edymtt]

@swift-ci please build toolchain Linux

[edymtt]

@swift-ci please build toolchain Windows

[edymtt]

@swift-ci please test Linux

[edymtt]

@swift-ci please build toolchain Windows

[edymtt]

@swift-ci please build toolchain Linux

[edymtt]

Looks like we have infrastructure issues for the Windows toolchain job

******************** TEST 'Swift(windows-x86_64) :: ModuleInterface/swift_build_sdk_interfaces/find-modules.test-sh' FAILED ********************
...
  File "c:\program files (x86)\microsoft visual studio\shared\python39_64\lib\multiprocessing\reduction.py", line 131, in detach
    return _winapi.DuplicateHandle(
    return _winapi.DuplicateHandle(
PermissionError: [WinError 5] Access is denied
PermissionError: [WinError 5] Access is denied

[edymtt]

@swift-ci please build toolchain Windows