RFR: 8258438: build error in test/hotspot/gtest/runtime/test_os.cpp

[Ioi Lam]

Please review this trivial fix for mach5 tier1 build failure:

test/hotspot/gtest/runtime/test_os.cpp:525:39: error: cannot convert 'const MEMFLAGS' to 'bool'
     char* p = os::reserve_memory(1 * M, mtInternal);
                                         ^^^^^^^^^^

It's caused by the following change in [os.hpp](url) in [JDK-8234930](https://bugs.openjdk.java.net/browse/JDK-8234930):

- static char*  reserve_memory(size_t bytes, MEMFLAGS flags = mtOther);
+ static char*  reserve_memory(size_t bytes, bool executable = false, MEMFLAGS flags = mtOther);

I am running a personal tier1 job to validate this fix.

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Commit messages:
 - 8258438: build error in test/hotspot/gtest/runtime/test_os.cpp

Changes: https://git.openjdk.java.net/jdk/pull/1788/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1788&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8258438
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1788.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1788/head:pull/1788

PR: https://git.openjdk.java.net/jdk/pull/1788