[ignition, debugger] correctly set position for return with elided bytecode.

test/mjsunit/mjsunit.status

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@@ skipping 791 matching lines @@
   # till it is optimized. So test timeouts.
   'array-literal-transitions': [SKIP],
 
   # TODO(mythria, 4680): Relate to GC and ignition holding references to
   # objects.
   'es6/mirror-collections': [FAIL],
 
   # TODO(mythria, 4680): line numbers in eval test. Coloumn number is
   # incorrect.
   'regress/regress-crbug-109362': [FAIL],
-
-  # TODO(mythria, 4680): possibly problem with line numbers.
-  'es6/regress/regress-468661': [FAIL],
-
 }],  # ignition == True
 
 ['ignition == True and arch == arm64', {
   # TODO(rmcilroy,4680): Arm64 specific timeouts.
   'asm/construct-double': [SKIP],
   'compiler/osr-one': [SKIP],
   'compiler/osr-two': [SKIP],
 }],  # ignition == True and arch == arm64
 
 ['ignition == True and arch == arm', {
   # TODO(rmcilroy,4680): Arm specific timeouts.
   'compiler/osr-one': [SKIP],
   'compiler/osr-two': [SKIP],
   'regress/regress-1257': [SKIP],
 }],  # ignition == True and arch == arm
 
 ##############################################################################
 ['gcov_coverage', {
   # Tests taking too long.
   'array-functions-prototype-misc': [SKIP],
 
   # Stack overflow.
   'big-array-literal': [SKIP],
 }],  # 'gcov_coverage'
 
 ]