Implemented support for mutating "value" argument of the replacement form for builtins.

...nodes/src/com/oracle/truffle/r/nodes/RTruffleVisitor.java

.../com/oracle/truffle/r/nodes/access/WriteVariableNode.java

...m/oracle/truffle/r/nodes/builtin/base/UpdateDimNames.java

...r/src/com/oracle/truffle/r/parser/ast/AccessVariable.java

...oracle/truffle/r/parser/ast/SimpleAccessTempVariable.java

...r.parser/src/com/oracle/truffle/r/parser/ast/Visitor.java

...r/src/com/oracle/truffle/r/parser/tools/BasicVisitor.java

...est/src/com/oracle/truffle/r/test/ExpectedTestOutput.test

...om/oracle/truffle/r/test/simple/TestSimpleArithmetic.java