Refactor advanceSlash to rely on a list of simplified tokens.
Refactor advanceSlash to rely on a list of simplified tokens.

Fixes #1340
Closes gh-1341

ariya/esprima,ariya/esprima,bcbcarl/esprima,jquery/esprima,ChromeDevTools/esprima,jquery/esprima,bcbcarl/esprima,ChromeDevTools/esprima,gibson042/esprima,ChromeDevTools/esprima,bcbcarl/esprima,gibson042/esprima,ariya/esprima,gibson042/esprima,jquery/esprima