MIPS: Enable the ll_prof profiler on MIPS.

src/log.cc

Index: src/log.cc
diff --git a/src/log.cc b/src/log.cc
index bad5fdc93098d9d32acaaa76d43400dbf141f823..eab26392e340af189db1500a8a77e1c367d2ffdc 100644
--- a/src/log.cc
+++ b/src/log.cc
@@ -1450,6 +1450,8 @@ void Logger::LogCodeInfo() {
   const char arch[] = "x64";
 #elif V8_TARGET_ARCH_ARM
   const char arch[] = "arm";
+#elif V8_TARGET_ARCH_MIPS
+  const char arch[] = "mips";
 #else
   const char arch[] = "unknown";
 #endif