address handling of matrices with empty dimensions in t and %*% builtins

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

...rc/com/oracle/truffle/r/nodes/builtin/base/Transpose.java

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

...le.r.test/src/com/oracle/truffle/r/test/all/AllTests.java

...t/src/com/oracle/truffle/r/test/failing/FailingTests.java

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

.../com/oracle/truffle/r/test/simple/TestSimpleBuiltins.java