RFR: 7172359: HTML parser StackOverflowError on invalid HTML: <li> tag inside an <option> [v4]

[Prasanta Sadhukhan]

> If there is invalid tag, stack terminates but it still tries to recurse through by calling legalElementContext() which results in StackOverflowError.
> Fix is to return if stack is terminated after checking current tag is not valid in current context
> 
> All other test/html/parser as well as other jtreg suite tests are ok with the fix.

Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:

  Add paranthesis

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10279/files
  - new: https://git.openjdk.org/jdk/pull/10279/files/46c477d8..c56601ee

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10279&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10279&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10279.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10279/head:pull/10279

PR: https://git.openjdk.org/jdk/pull/10279