alright, since this post is already pumped again, I'd better report some more recent discoveries.

1, apparently there will be a "corefx.dll", which is the equivalent of "mscorlib.dll"

and 2, I found some support of this native compilation clr in these shipped files:

Microsoft.Diagnostics.Runtime.dll
the new version embedded in PerfView 1.5 added support for mrt100_app.dll

Microsoft.Diagnostics.Tracing.TraceEvent.dll
the new version embedded in PerfView 1.5 supports PDB symbols of merged IL assemblies, and the default one is "corefx.dll"

msdia120.dll, supports PDB symbols of merged IL assemblies

vsdebugeng.impl.dll in VS2013, substantial support of native compilation clr debugging.

for example, all the NC*.obj files are new in VS2013

manageddm.nativeproj_238158893\objr\x86\NCBreakpoint.obj
manageddm.nativeproj_238158893\objr\x86\NCClassData.obj
manageddm.nativeproj_238158893\objr\x86\NCClrInstanceFactory.obj
manageddm.nativeproj_238158893\objr\x86\NCClrLibraryProvider.obj
manageddm.nativeproj_238158893\objr\x86\NCDbiCallback.obj
manageddm.nativeproj_238158893\objr\x86\NCManagedThreadDataObject.obj
manageddm.nativeproj_238158893\objr\x86\NCMergedAssemblyRecord.obj
manageddm.nativeproj_238158893\objr\x86\NCMrtDllExportSteppingTable.obj
manageddm.nativeproj_238158893\objr\x86\NCNativeModuleFilter.obj
manageddm.nativeproj_238158893\objr\x86\NCShimLoader.obj
manageddm.nativeproj_238158893\objr\x86\NCStepperDataItem.obj
manageddm.nativeproj_238158893\objr\x86\NCSymbolImpl.obj
manageddm.nativeproj_238158893\objr\x86\NCSymbolProvider.obj
manageddm.nativeproj_238158893\objr\x86\NcInstructionAddress.obj
manageddm.nativeproj_238158893\objr\x86\_NCEntrypoint.obj