[foreign-jextract] RFR: 8238316: jextract emits a C_BOOL when source says char

[Athijegannathan Sundararajan]

Using SystemABI.Type of MemoryLayouts to generate layout constants

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Commits:
 - 94d1068a: 8238316: jextract emits a C_BOOL when source says char

Changes: https://git.openjdk.java.net/panama-foreign/pull/25/files
 Webrev: https://webrevs.openjdk.java.net/panama-foreign/25/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8238316
  Stats: 144 lines in 5 files changed: 108 ins; 17 del; 19 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/25.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/25/head:pull/25

PR: https://git.openjdk.java.net/panama-foreign/pull/25