A64: Record the size of veneer pools for code offset mapping.

src/a64/assembler-a64.h

Index: src/a64/assembler-a64.h
diff --git a/src/a64/assembler-a64.h b/src/a64/assembler-a64.h
index 09a8a72014d9c7885266576e35094c6b60926e23..63fbcad825a0862644f5db3424c87cd5db660399 100644
--- a/src/a64/assembler-a64.h
+++ b/src/a64/assembler-a64.h
@@ -839,6 +839,7 @@ class Assembler : public AssemblerBase {
   static int ConstantPoolSizeAt(Instruction* instr);
   // See Assembler::CheckConstPool for more info.
   void ConstantPoolMarker(uint32_t size);
+  void EmitPoolGuard();
   void ConstantPoolGuard();
 
   // Prevent veneer pool emission until EndBlockVeneerPool is called.
@@ -877,20 +878,20 @@ class Assembler : public AssemblerBase {
 
   // Record the emission of a constant pool.
   //
-  // The emission of constant pool depends on the size of the code generated and
-  // the number of RelocInfo recorded.
+  // The emission of constant and veneer pools depends on the size of the code
+  // generated and the number of RelocInfo recorded.
   // The Debug mechanism needs to map code offsets between two versions of a
   // function, compiled with and without debugger support (see for example
   // Debug::PrepareForBreakPoints()).
   // Compiling functions with debugger support generates additional code
-  // (Debug::GenerateSlot()). This may affect the emission of the constant
-  // pools and cause the version of the code with debugger support to have
-  // constant pools generated in different places.
-  // Recording the position and size of emitted constant pools allows to
-  // correctly compute the offset mappings between the different versions of a
-  // function in all situations.
+  // (Debug::GenerateSlot()). This may affect the emission of the pools and
+  // cause the version of the code with debugger support to have pools generated
+  // in different places.
+  // Recording the position and size of emitted pools allows to correctly
+  // compute the offset mappings between the different versions of a function in
+  // all situations.
   //
-  // The parameter indicates the size of the constant pool (in bytes), including
+  // The parameter indicates the size of the pool (in bytes), including
   // the marker and branch over the data.
   void RecordConstPool(int size);
 
@@ -1754,11 +1755,12 @@ class Assembler : public AssemblerBase {
   // in the future for example if we decide to add nops between the veneers.
   static const int kMaxVeneerCodeSize = 1 * kInstructionSize;
 
+  void RecordVeneerPool(int location_offset, int size);
   // Emits veneers for branches that are approaching their maximum range.
   // If need_protection is true, the veneers are protected by a branch jumping
   // over the code.
   void EmitVeneers(bool need_protection, int margin = kVeneerDistanceMargin);
-  void EmitVeneersGuard();
+  void EmitVeneersGuard() { EmitPoolGuard(); }
   // Checks whether veneers need to be emitted at this point.
   void CheckVeneerPool(bool require_jump, int margin = kVeneerDistanceMargin);