The debug icons used are from the eclipse project.
In particular they have been extracted as gif files from org.eclipse.debug.ui-3.3.2.jar
(see eclipse icons source folder)
and after that they have been changed into .ico files using the Axialis icon editor.

Updated with:
http://git.eclipse.org/c/platform/eclipse.platform.debug.git/
and S4_14_0_RC2

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Wil