Add graph intrinsics for many math library functions:

runtime/vm/intrinsifier_mips.cc

Index: runtime/vm/intrinsifier_mips.cc
diff --git a/runtime/vm/intrinsifier_mips.cc b/runtime/vm/intrinsifier_mips.cc
index c579e4ca634b0ce5b9c5ec12c7e9ec2d891b2127..154493a7ae1319b623b8c1a2d5ae006626b5f8ca 100644
--- a/runtime/vm/intrinsifier_mips.cc
+++ b/runtime/vm/intrinsifier_mips.cc
@@ -31,6 +31,18 @@ namespace dart {
 intptr_t Intrinsifier::ParameterSlotFromSp() { return -1; }
 
 
+void Intrinsifier::IntrinsicCallPrologue(Assembler* assembler) {
+  assembler->Comment("IntrinsicCallPrologue");
+  assembler->mov(CALLEE_SAVED_TEMP, RA);
+}
+
+
+void Intrinsifier::IntrinsicCallEpilogue(Assembler* assembler) {
+  assembler->Comment("IntrinsicCallEpilogue");
+  assembler->mov(RA, CALLEE_SAVED_TEMP);
+}
+
+
 // Intrinsify only for Smi value and index. Non-smi values need a store buffer
 // update. Array length is always a Smi.
 void Intrinsifier::ObjectArraySetIndexed(Assembler* assembler) {