RFR: 8256380: JDK-8254162 broke 32bit windows build

[Jorn Vernee]

Fix win-32 linker error due to forward declaration and definition signature mismatch.

FWIW, the altered header is included from nativeLookup.cpp, which uses the function pointer of that function. But, since the signature of the definition [1] is different, and due to name mangling on the particular ABI, the symbols of the declaration in the header and definition are different as well, and things fail to link later.

[1] https://github.com/openjdk/jdk/blob/master/src/hotspot/share/prims/scopedMemoryAccess.cpp#L181

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Commit messages:
 - Fix win-32 linker error due to forward declaration and definition signature mismatch

Changes: https://git.openjdk.java.net/jdk/pull/1222/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1222&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256380
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1222.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1222/head:pull/1222

PR: https://git.openjdk.java.net/jdk/pull/1222