RFR: JDK-8035787: SourcePositions are wrong for Strings concatenated with '+' operator

[Liam Miller-Cushon]

Hi,

Please consider this change to add a regression test for start position
handling of folding string literals.The associated bug (JDK-8035787) was
fixed by more recent improvements to string literal folding (JDK-8134007),
this patch just adds a regression test to ensure the start positions
continue to be correct.

(JDK-8035787 also mentions an issue with end positions for string literals
in single-element annotations, but as discussed in the bug that part
appears to be working as intended.)

bug: https://bugs.openjdk.java.net/browse/JDK-8035787
webrev: http://cr.openjdk.java.net/~cushon/8035787/webrev.00/

Thanks,
Liam
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