Changes

TCF Debugger: Fix sources not shown initially in disassembly

Main change:
 - Applies to: org.eclipse.tcf/plugins/org.eclipse.tcf.cdt.ui/src/org/eclipse/tcf/internal/cdt/ui/disassembly/TCFDisassemblyBackend.java
 - Call doPending to finish any pending tasks like setting the sources

Impacts:
 - Fix disasm viewer sets update source pending after receiving is done