[IR Framework] Add missing compilation level restriction when using FlipC1C2 stress option

The newly converted IR tests (JDK-8263024) are not yet stable when using various IR framework stress options like -DExcludeRandom or -DFlipC1C2. These tests needs to be fixed. There could also be a bug in the IR framework when using these options.

Edit: Turns out the FlipC1C2 option forgets to restrict the compilation level once a C1 compilation is replaced with a C2 compilation and vice verca. This results in an error when the test is run with -XX:-TieredCompilation or -XX:TieredStopAtLevel=1,2,3.