[GR-2737] Rework switching of allocation tracing, cleanups.

...library/src/com/oracle/truffle/r/library/utils/Rprof.java

...rary/src/com/oracle/truffle/r/library/utils/Rprofmem.java

...src/com/oracle/truffle/r/nodes/builtin/base/AsVector.java

...oracle/truffle/r/nodes/builtin/base/TrigExpFunctions.java

...om/oracle/truffle/r/nodes/builtin/fastr/FastRInterop.java

.../com/oracle/truffle/r/nodes/builtin/fastr/FastRStats.java

...uffle/r/nodes/builtin/fastr/memprof/FastRprofmemShow.java

...e/r/nodes/builtin/fastr/memprof/FastRprofmemSnapshot.java

...fle/r/nodes/builtin/fastr/memprof/FastRprofmemSource.java

...e/truffle/r/nodes/castsTests/ResultTypesAnalyserTest.java

...ruffle/r/nodes/access/vector/CachedReplaceVectorNode.java

...es/src/com/oracle/truffle/r/nodes/unary/CastListNode.java

...me/src/com/oracle/truffle/r/runtime/context/RContext.java

...e/src/com/oracle/truffle/r/runtime/data/RDataFactory.java

...e/r/runtime/instrument/memprof/MemAllocProfilerPaths.java

.../com/oracle/truffle/r/runtime/interop/ForeignArray2R.java