* commit 'f9cd9395':
  Correct use of Source.internal()
  check style  fix; RPerfStats option fix
  Instrumentation refactoring. Retire RNodeTimer, REntryCounts; replace with RFunctionProfiler Retire FunctionUID replace use with SourceSection Refactor all context-specific instrumentation state into InstrumentationState class
  Enable rowsum test
  remove old FastROption
  row sum_matrix:  use AbstractVectors
  Rprof: move state into RContext
  Add support for storing Profiler in Context; more RSource cleanup/functions
  RowsumFunctions: cast pipeline review fixes
  Move RInternalInternalSourceDescriptions into RSource
  compiler fixes
  Tighten up Rsource methods, use getURI instead of getPath, set .internal() on internal sources Implement line.profiling
  Implement Rprof (no lineProfiling, memProfiling, gcProfiling)
  remove old  comment
  Implement rowsums_matrix (needed by summaryRprof); enable tests
  Change "description" to "name" in FunctionDefinitionNode. Fixes regression on source'd functions where name was lost (description is already used in Node for some other meaning)
  Provide access to Polyglot engine instance from Context

Merge pull request #167 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:bugfix/IOException_warnings to master

* commit 'aa92a44d':
  fix warnings for non-thrown IOExceptions

Merge pull request #168 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/remove_NamedRNode to master

* commit 'd210c2ee':
  remove NamedRNode (use field in RLanguage instead)

Merge pull request #166 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/reduce_arguments_subclasses to master

* commit '1252cb44':
  reduce the number of Arguments subclasses

Retire RNodeTimer, REntryCounts; replace with RFunctionProfiler
Retire FunctionUID replace use with SourceSection
Refactor all context-specific instrumentation state into InstrumentationState class

Merge pull request #162 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:bugfix/refcounting-lists to master

* commit '55fc122f':
  Avoid copying of temporary data when assigning to a list

* commit 'c8319850':
  Wrap only IOException to RuntimeException. Leave other exceptions untouched.
  Adjusting the code to not expect IOException from PolyglotEngine.eval and co.

Merge pull request #146 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:bugfix/field_substitute to master

* commit '160a5a4f':
  fix various warnings
  fix calls with erroneous "string" targets
  do not treat String constants specially when creating calls
  handle replacements of field accesses

Merge pull request #163 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:bugfix/visibility_fixes to master

* commit 'b7e995a2':
  fix visibility of some builtins and enable passing tests

Merge pull request #149 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/match-call-after-use-method to master

* commit 'fff00eee':
  Tests for S3 group dispatch, match.call, syscall
  Fix S3 dispatches according to the first non-missing argument
  Fix: default argument na.rm for Summary methods
  Fix: match.call() works properly with S3 dispatch

* commit '3a3a55e4':
  fix dimnames bug; move code from RVector to vector extract code

Fix of arguments matching for S3 with respect to default arguments
reveals that Summary methods were not receiving na.rm argument,
which has default value in the dispatch methods, e.g.
max(...,na.rm=FALSE) calls max.myclass(...,na.rm), if invoked as max(value),
the na.rm parameter in max.myclass is missing.

The solution is semi-generic: FunctionDispatch.execute gets another parameter
that should carry the default arguments from S3 group dispatch the method
dispatched to. This parameter can, however, be only null or RArguments.SUMMARY_GROUP_DEFAULT_VALUE_NA_RM.
This parameter is passed to ArgumentMatcher, which does identity check on the
only possible value for the time being and performs the matching accordingly.

Involves fixing of matching arguments for UseMethod/NextMethod -- arguments
with default values, for which the caller does not provide any value,
are ignored and not passed to the S3 generic, not even as varargs.

ArgumentMatcher puts a special placeholder into the signature for
arguments that were 'unmatched' (with default value, but not provided).
CallMatcherNode then removes such args from the arguments array and
from the signature and continues as normal.

* commit '5077e23b':
  update truffle version to 91254ff6b437dbfbb4cf8f063abfb880c3ff3e2f