Remove components.push from CppMangleVisitor::substitute
Replace CppMangleVisitor::exist with CppMangleVisitor::substitute
Return early if substitute found, remove nesting level.
Merge pull request #3121 from ibuclaw/subsitute

Fix CppMangleVisitor::substitute and Remove CppMangleVisitor::exist
fix Issue 11944 - ICE(expression.c) Assertion `f' failed.
Merge pull request #3125 from 9rnsr/fix11944

Issue 11944 - ICE(expression.c) Assertion `f' failed.