[JENKINS-19383]

Escape hatch to disable bytecode transformation in case this causes other unforeseen problems.

(cherry picked from commit f98c4627da3c21e37aff82c75c0ef7240e60b4da)
[FIXED JENKINS-19383]

Fixed a bug in bytecode-compatibility-transformer where class file
format prior to 1.49 cannot have the ldc instruction pointing to a class
constant.

(cherry picked from commit 27d1a03866e468d2d9b630f636e53ec7804e4ade)

Conflicts:
	changelog.html