[Integrated] [foreign-jextract] RFR: 8240602: port more tests from old jextract tests

[Athijegannathan Sundararajan]

Changeset: 5cf8520c
Author:    Athijegannathan Sundararajan <sundar at openjdk.org>
Date:      2020-03-05 13:57:44 +0000
URL:       https://git.openjdk.java.net/panama-foreign/commit/5cf8520c

8240602: port more tests from old jextract tests

Reviewed-by: jvernee

! src/jdk.incubator.jextract/share/classes/jdk/incubator/jextract/tool/Main.java
! src/jdk.incubator.jextract/share/classes/jdk/internal/jextract/impl/TypeImpl.java
+ test/jdk/tools/jextract/BadBitfieldTest.java
+ test/jdk/tools/jextract/ConstantsTest.java
! test/jdk/tools/jextract/RepeatedDeclsTest.java
+ test/jdk/tools/jextract/UniondeclTest.java
+ test/jdk/tools/jextract/badBitfields.h
+ test/jdk/tools/jextract/constants.h
+ test/jdk/tools/jextract/constants_aux.h
+ test/jdk/tools/jextract/uniondecl.h