Clean up LineLoopIndirectTest

  The helper test function runTest() for LineLoopIndirectTest
includes some special cases in its args that are not used in all
cases, such as consecutive indirect calls. This CL aims to split
this function into separate test cases to make each test more
readable.

* Added functions for some of the common procedures.

* Split runTest() into each test suite with the help of the common
  functions and values as well as the special cases for each.

* Removed runTest() from this test suite.

* Updated an old bug number (667 -> 42265165).

Bug: angleproject:360758685
Change-Id: I98e1facff0a6bad0ee2deca9313644379345d9c5
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5892535
Commit-Queue: Amirali Abdolrashidi <[email protected]>
Reviewed-by: Shahbaz Youssefi <[email protected]>
Reviewed-by: Charlie Lao <[email protected]>