[INTERNAL] sap.ui.test.BranchTracking: improve instrumentation
[INTERNAL] sap.ui.test.BranchTracking: improve instrumentation

For testing, run 1Ring with code coverage on minified Decimal|getScale
Follow-up to change #3041909
(commit 684c62ec86cfc4ef0c5abe4e8bc8a46d7b95818c)

PS1: handle minified code like "return(x||y);"
PS2: refactoring

Change-Id: I91d8f9d21513b210d7fe2f640dd475079f056f5d

SAP/openui5,cschuff/openui5,cschuff/openui5,SAP/openui5,SAP/openui5,cschuff/openui5,SAP/openui5