[Interpreter] No longer require context machine register in bytecode handlers

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
index 436e7be521aa95a0f98071732fba1d4381c354cc..925e00e39108ef4f542b2e2d53f456eb6b1ee6b3 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -23,14 +23,12 @@ const Register kInterpreterAccumulatorRegister = {Register::kCode_eax};
 const Register kInterpreterRegisterFileRegister = {Register::kCode_edx};
 const Register kInterpreterBytecodeOffsetRegister = {Register::kCode_ecx};
 const Register kInterpreterBytecodeArrayRegister = {Register::kCode_edi};
+const Register kInterpreterDispatchTableRegister = {Register::kCode_esi};
 const Register kJavaScriptCallArgCountRegister = {Register::kCode_eax};
 const Register kJavaScriptCallNewTargetRegister = {Register::kCode_edx};
 const Register kRuntimeCallFunctionRegister = {Register::kCode_ebx};
 const Register kRuntimeCallArgCountRegister = {Register::kCode_eax};
 
-// Spill slots used by interpreter dispatch calling convention.
-const int kInterpreterDispatchTableSpillSlot = -1;
-
 // Convenience for platform-independent signatures.  We do not normally
 // distinguish memory operands from other operands on ia32.
 typedef Operand MemOperand;