Add test case for host running on pwr10

Author: Kai Luo

compiler-rt/test/orc/TestCases/Linux/ppc64/trivial-tls-pwr10.cpp

@@ -0,0 +1,35 @@
+// RUN: %clangxx -fPIC -c -o %t %s
+// RUN: %llvm_jitlink %t
+
+#include <fstream>
+#include <iostream>
+#include <string>
+
+thread_local int x = 0;
+thread_local int y = 1;
+thread_local int z = -1;
+
+static int __attribute__((target("arch=pwr10"))) TestPOWER10() {
+  return x + y + z;
+}
+
+static int Test() { return x + y + z; }
+
+static bool CPUModelIsPOWER10() {
+  std::string line;
+  std::ifstream cpuinfo("/proc/cpuinfo", std::ios::in);
+  if (!cpuinfo.is_open())
+    return false;
+  while (std::getline(cpuinfo, line)) {
+    if (line.find("cpu") != std::string::npos &&
+        line.find("POWER10") != std::string::npos)
+      return true;
+  }
+  return false;
+}
+
+int main() {
+  if (CPUModelIsPOWER10())
+    return TestPOWER10();
+  return Test();
+}