RFR(S): 8151880: EnqueueMethodForCompilationTest.java still fails to compile method

[Nils Eliasson]

Hi all,

Please review this fix.

Summary:
There is a mismatch in the CompilerWhiteBox testcases between the 
callable and the executable constructors. SimpleTestCase$Helper 
implements all constructors and methods that are tested. However since 
Helper is an inner class there will be an extra (javac created) 
constructor that has the parent class as an appended argument. The 
callable will invoke this constructor, but the executable will reference 
the normal constructor.

Solution:
Stop have the Helper as an inner class. Rename it to 
SimpleTestCaseHelper for some uniqueness in compiler commands and 
directives.

Testing:
Run all hotspot/compiler/whitebox tests on all platforms, and all 
hotspot/compiler tests on one platform.

Bug: https://bugs.openjdk.java.net/browse/JDK-8151880
Webrev: http://cr.openjdk.java.net/~neliasso/8151880/webrev.02/

Best regards,
Nils Eliasson