Provide ia32 intrinsics for bigint add, sub, quotient digit estimation, and

runtime/vm/intrinsifier_arm.cc

Index: runtime/vm/intrinsifier_arm.cc
===================================================================
--- runtime/vm/intrinsifier_arm.cc	(revision 40816)
+++ runtime/vm/intrinsifier_arm.cc	(working copy)
@@ -894,6 +894,16 @@
 }
 
 
+void Intrinsifier::Bigint_add(Assembler* assembler) {
+  // TODO(regis): Implement.
+}
+
+
+void Intrinsifier::Bigint_sub(Assembler* assembler) {
+  // TODO(regis): Implement.
+}
+
+
 void Intrinsifier::Bigint_mulAdd(Assembler* assembler) {
   // TODO(regis): Implement.
 }
@@ -904,6 +914,16 @@
 }
 
 
+void Intrinsifier::Bigint_estQuotientDigit(Assembler* assembler) {
+  // TODO(regis): Implement.
+}
+
+
+void Intrinsifier::Montgomery_mulMod(Assembler* assembler) {
+  // TODO(regis): Implement.
+}
+
+
 // Check if the last argument is a double, jump to label 'is_smi' if smi
 // (easy to convert to double), otherwise jump to label 'not_double_smi',
 // Returns the last argument in R0.