[PowerPC] Add identification for POWER8NVL

This CPU type was not previously recognized by LLVM which led to emitting
poor (and sometimes incorrect) code in some JIT workloads on such a machine.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290961 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/Host.cpp

@@ -1069,6 +1069,7 @@ StringRef sys::getHostCPUName() {
       .Case("POWER7", "pwr7")
       .Case("POWER8", "pwr8")
       .Case("POWER8E", "pwr8")
+      .Case("POWER8NVL", "pwr8")
       .Case("POWER9", "pwr9")
       .Default(generic);
 }