Fix -Wshorten-64-to-32 errors on clang ARM64

src/base/cpu.cc

Index: src/base/cpu.cc
diff --git a/src/base/cpu.cc b/src/base/cpu.cc
index 90ed35138319c4ee27b6ee5cab4289c03e9063c7..cf1f9c399db413883507c15d4db847634cdb92ee 100644
--- a/src/base/cpu.cc
+++ b/src/base/cpu.cc
@@ -607,7 +607,7 @@ CPU::CPU()
   char* implementer = cpu_info.ExtractField("CPU implementer");
   if (implementer != NULL) {
     char* end;
-    implementer_ = strtol(implementer, &end, 0);
+    implementer_ = static_cast<int>(strtol(implementer, &end, 0));
     if (end == implementer) {
       implementer_ = 0;
     }
@@ -617,7 +617,7 @@ CPU::CPU()
   char* variant = cpu_info.ExtractField("CPU variant");
   if (variant != NULL) {
     char* end;
-    variant_ = strtol(variant, &end, 0);
+    variant_ = static_cast<int>(strtol(variant, &end, 0));
     if (end == variant) {
       variant_ = -1;
     }
@@ -628,7 +628,7 @@ CPU::CPU()
   char* part = cpu_info.ExtractField("CPU part");
   if (part != NULL) {
     char* end;
-    part_ = strtol(part, &end, 0);
+    part_ = static_cast<int>(strtol(part, &end, 0));
     if (end == part) {
       part_ = 0;
     }