in the switch case statements

This code change preprocesses the AST used for ASTView to remove the
implicit break statements as well as to handle the implicit break
statements with expression in Switch Statements and Switch Expressions

Change-Id: I761f1d7652b9c791d24f4127abd692ebb7529771
Signed-off-by: Kalyan Prasad Tatavarthi <kalyan_prasad@in.ibm.com>