[Interpreter] Inline some functions to improve expression depth of binary ops.

Inlines some functions to improve reduce the stack requirements for
chains of binary operations in the bytecode generator, thereby
enabling support of deeper expression stacks.

BUG=chromium:731861

Change-Id: I5ca437d507e9b2a7eb74f33deaa708ecd646077b
Reviewed-on: https://chromium-review.googlesource.com/541356
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46080}

src/interpreter/bytecode-generator.h

@@ -195,13 +195,14 @@ class BytecodeGenerator final : public AstVisitor<BytecodeGenerator> {
   TypeHint VisitForAccumulatorValue(Expression* expr);
   void VisitForAccumulatorValueOrTheHole(Expression* expr);
   MUST_USE_RESULT Register VisitForRegisterValue(Expression* expr);
-  void VisitForRegisterValue(Expression* expr, Register destination);
+  INLINE(void VisitForRegisterValue(Expression* expr, Register destination));
   void VisitAndPushIntoRegisterList(Expression* expr, RegisterList* reg_list);
   void VisitForEffect(Expression* expr);
   void VisitForTest(Expression* expr, BytecodeLabels* then_labels,
                     BytecodeLabels* else_labels, TestFallthrough fallthrough);
-  TypeHint VisitForAddOperand(Expression* expr, RegisterList* operand_registers,
-                              Register* out_register);
+  INLINE(TypeHint VisitForAddOperand(Expression* expr,
+                                     RegisterList* operand_registers,
+                                     Register* out_register));
   void VisitInSameTestExecutionScope(Expression* expr);
 
   // Returns the runtime function id for a store to super for the function's