VM: Re-format to use at most one newline between functions

runtime/vm/cpu_x64.cc

Index: runtime/vm/cpu_x64.cc
diff --git a/runtime/vm/cpu_x64.cc b/runtime/vm/cpu_x64.cc
index 72b3478e8a5419d9caa046a60afc6f1dd827dde4..47637fd7260f8846c6cbd61d158ee8e25d792a3a 100644
--- a/runtime/vm/cpu_x64.cc
+++ b/runtime/vm/cpu_x64.cc
@@ -19,17 +19,14 @@ namespace dart {
 
 DEFINE_FLAG(bool, use_sse41, true, "Use SSE 4.1 if available");
 
-
 void CPU::FlushICache(uword start, uword size) {
   // Nothing to be done here.
 }
 
-
 const char* CPU::Id() {
   return "x64";
 }
 
-
 bool HostCPUFeatures::sse2_supported_ = true;
 bool HostCPUFeatures::sse4_1_supported_ = false;
 const char* HostCPUFeatures::hardware_ = NULL;
@@ -48,7 +45,6 @@ void HostCPUFeatures::InitOnce() {
 #endif
 }
 
-
 void HostCPUFeatures::Cleanup() {
   DEBUG_ASSERT(initialized_);
 #if defined(DEBUG)