[11u] RFR (XS) 8265537: x86 version string truncated after JDK-8249672 11u backport

[Aleksey Shipilev]

11u-specific regression:
   https://bugs.openjdk.java.net/browse/JDK-8265537

See the details in the bug.

11u patch:

diff -r 9846af5a0949 src/hotspot/cpu/x86/vm_version_x86.cpp
--- a/src/hotspot/cpu/x86/vm_version_x86.cpp    Mon Apr 19 12:47:46 2021 +0200
+++ b/src/hotspot/cpu/x86/vm_version_x86.cpp    Tue Apr 20 19:23:24 2021 +0200
@@ -743,11 +743,11 @@
      if (is_knights_family()) {
        _features &= ~CPU_VZEROUPPER;
      }
    }

-  char buf[256];
+  char buf[512];
    jio_snprintf(buf, sizeof(buf),
                 "(%u cores per cpu, %u threads per core) family %d model %d stepping %d microcode 0x%x"
                 "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
                 cores_per_cpu(), threads_per_core(),
                 cpu_family(), _model, _stepping, os::cpu_microcode_revision(),

Testing: compiler/intrinsics/sha tests (now pass); tier1

-- 
Thanks,
-Aleksey