A "handful" of missing test cases

[SoniEx2]

EHv4:

• exnref interaction with globals
• try_table accepts param?
• updating locals in a try_table block, then throwing:
  • within the same function
  • with a separate throwing function
• throwing immediately before try_table
• catching in a loop ( add a little more complex case with a loop block #325 )
• throw null
• exnref binary encoding

EHL:

• try accepts param?
• updating locals in a try block, then throwing:
  • within the same function
  • with a separate throwing function ( [legacy] Add setjmp bait #332 )
• throwing immediately before try
• catching in a loop
• updating locals after catching
  • multiple locals of the same type