RFR: Backport of fix for https://bugs.openjdk.java.net/browse/JDK-8129740

[Srikanth]

Hello!

https://bugs.openjdk.java.net/browse/JDK-8157142 requests for a backport 
of the
fix made for https://bugs.openjdk.java.net/browse/JDK-8129740

(1) The original patch does not apply as is after path shuffling.

However, manual application of the two failed hunks in 
LambdaToMethod.java is straightforward
and does not call for any real change in code.

(2) The file 
test/tools/javac/lambda/T8129740/SourceToSourceTranslationTest.java
required some rewriting since the ToolBox class API is different between
JDK9 and JDK8.

Langtools + JCK tests have been run and are all green.

Please review here:

http://cr.openjdk.java.net/~sadayapalam/JDK-8157142/webrev.00/

Thanks in advance,
Srikanth

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