Fixed empty language in profiler.

(cherry picked from commit 692c45c)

Author: Miloslav Metelka

com.oracle.truffle.r.runtime/src/com/oracle/truffle/r/runtime/instrument/memprof/MemAllocProfilerPaths.java

@@ -39,6 +39,7 @@
 import com.oracle.truffle.api.interop.TruffleObject;
 import com.oracle.truffle.api.source.Source;
 import com.oracle.truffle.api.source.SourceSection;
+import com.oracle.truffle.r.runtime.RRuntime;
 import com.oracle.truffle.r.runtime.context.RContext;
 
 public final class MemAllocProfilerPaths {
@@ -238,7 +239,7 @@ public void set(long allocated, long count) {
                 this.id = paths.idGen.getAndIncrement();
                 this.parent = parent;
                 this.name = name;
-                this.sourceSection = sourceSection == null ? Source.newBuilder("", "", name).mimeType("").build().createUnavailableSection() : sourceSection;
+                this.sourceSection = sourceSection == null ? Source.newBuilder(RRuntime.R_LANGUAGE_ID, "", name).build().createUnavailableSection() : sourceSection;
                 this.paths.entryMap.put(id, this);
                 if (parent != null) {
                     parent.children.put(this.sourceSection, this);