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

runtime/vm/instructions_x64.h

Index: runtime/vm/instructions_x64.h
diff --git a/runtime/vm/instructions_x64.h b/runtime/vm/instructions_x64.h
index 56add2e461605434501bc79282acde031f6449f8..0c58007ce657aa41d7df96c02b078d77eff3ac51 100644
--- a/runtime/vm/instructions_x64.h
+++ b/runtime/vm/instructions_x64.h
@@ -20,11 +20,9 @@ class RawClass;
 class Immediate;
 class RawObject;
 
-
 intptr_t IndexFromPPLoad(uword start);
 intptr_t IndexFromPPLoadDisp8(uword start);
 
-
 // Template class for all instruction pattern classes.
 // P has to specify a static pattern and a pattern length method.
 template <class P>
@@ -64,7 +62,6 @@ class InstructionPattern : public ValueObject {
   DISALLOW_COPY_AND_ASSIGN(InstructionPattern);
 };
 
-
 class ReturnPattern : public InstructionPattern<ReturnPattern> {
  public:
   explicit ReturnPattern(uword pc) : InstructionPattern(pc) {}
@@ -80,7 +77,6 @@ class ReturnPattern : public InstructionPattern<ReturnPattern> {
   static const int kLengthInBytes = 1;
 };
 
-
 // push rbp
 // mov rbp, rsp
 class ProloguePattern : public InstructionPattern<ProloguePattern> {
@@ -99,7 +95,6 @@ class ProloguePattern : public InstructionPattern<ProloguePattern> {
   static const int kLengthInBytes = 4;
 };
 
-
 // mov rbp, rsp
 class SetFramePointerPattern
     : public InstructionPattern<SetFramePointerPattern> {