Add graph intrinsics for many math library functions:

runtime/vm/intrinsifier_arm.cc

Index: runtime/vm/intrinsifier_arm.cc
diff --git a/runtime/vm/intrinsifier_arm.cc b/runtime/vm/intrinsifier_arm.cc
index d0b05d8bdfd1c27c78c268cffe27ebc6d45b1853..1b825a3c977880faabefe59a37337368c26c0f41 100644
--- a/runtime/vm/intrinsifier_arm.cc
+++ b/runtime/vm/intrinsifier_arm.cc
@@ -32,6 +32,20 @@ namespace dart {
 intptr_t Intrinsifier::ParameterSlotFromSp() { return -1; }
 
 
+void Intrinsifier::IntrinsicCallPrologue(Assembler* assembler) {
+  // Save LR by moving it to a callee saved temporary register.
+  assembler->Comment("IntrinsicCallPrologue");
+  assembler->mov(CALLEE_SAVED_TEMP, Operand(LR));
+}
+
+
+void Intrinsifier::IntrinsicCallEpilogue(Assembler* assembler) {
+  // Restore LR.
+  assembler->Comment("IntrinsicCallEpilogue");
+  assembler->mov(LR, Operand(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) {