Add HeapSmall.PruneSMT #86

Job	Run time
build	10m 41s
test (BoxingTests.Kernel)	7m 30s
test (Cosmos.Compiler.Tests.TypeSystem.Kernel)	7m 47s
test (Cosmos.Compiler.Tests.Bcl.Kernel)	9m 35s
test (Cosmos.Compiler.Tests.Bcl.System.Kernel)	6m 27s
test (Cosmos.Compiler.Tests.Exceptions.Kernel)	3m 19s
test (Cosmos.Compiler.Tests.MethodTests.Kernel)	2m 56s
test (Cosmos.Compiler.Tests.SingleEchoTest.Kernel)	3m 3s
test (Cosmos.Kernel.Tests.Fat.Kernel)	19m 38s
test (Cosmos.Kernel.Tests.IO.Kernel)	5m 57s
test (SimpleStructsAndArraysTest.Kernel)	6m 5s
test (Cosmos.Kernel.Tests.DiskManager.Kernel)	9m 21s
test (GraphicTest.Kernel)	4m 0s
test (NetworkTest.Kernel)	7m 35s
test (AudioTests.Kernel)	8m 8s
test (MemoryOperationsTest.Kernel)	3m 26s
test (ProcessorTests.Kernel)	8m 48s
	2h 4m 16s

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