[1.7] PolymorphicSignatureTest fails with J9VM, passes with Sun VM.

J9's system class loader can handle [Ljava.lang.Object; but was not
served with them since they were not recognized as excluded.

Bug: 386816
Change-Id: I48bea90531ae451a7a617de8df854bbfd6af2f2d
Fixed Bug 345305 - [compiler][null] Compiler misidentifies a case of
"variable can only be null"
 
Fixed by decoupling null analysis for try-finally from def.assign
analysis.

Change-Id: I17285d5034aa6cdcc390c41bbde121cb024b648c
Bug 386181 - [compiler][null] wrong transition in
UnconditionalFlowInfo.mergedWith()
Bug 385415 - Incorrect resource leak detection
Bug 380048 - error popup when navigating to source files
Bug 388630 - @NonNull diagnostics at line 0
Fix or bug 388137 - MethodBinding.getJavaElement() returns
non-existing method
Bug 387612 - Unreachable catch block...exception is never thrown from
the try
Bug 388996 - [compiler][resource] Incorrect 'potential resource leak'
Bug 386534 -  [compiler][resource] "Potential resource leak" false
positive warning
Bug 379784 - [compiler] "Method can be static" is not getting reported
Bug 379834 - Wrong "method can be static" in presence of
qualified super and different staticness of nested super class.
Bug 388137 - MethodBinding.getJavaElement() returns non-existing method
- add cleanup to avoid failures in subsequent tests.
Fix for bug 390191: Exclude jdt.core from packing
Fix for bug 385593: [compiler] Unexpected stackmap frames
Bug 375366 - ECJ ignores unusedParameterIncludeDocCommentReference
unless enableJavadoc option is set

Fix by
- considering more options from "-properties <file>"
- using a few different defaults when -properties is set.

Change-Id: I3850501d781c42ef7852445057c4ca7c9ae5fe5b
Fixed bug 385780: No warning for unused generic parameters
Fixed bug 391092: [1.7][compiler] ECJ accepts invalid union type
reference
Fix for bug 391707: Javadoc summary of IJavaProject#findType(String)
should mention that it does not find secondary types in compilation unit
Bug 383072 - problem with parents