Add support for CallKind::kCallOnMainAndSlowPath

Some of the intrinsics call on both the main and slowpath. This patch
adds support for such a CallKind and marks the intrinsics accordingly.

This will be exercised by a later patch that refactors all the runtime
calls to use InvokeRuntime().

Please note that without this patch, the calls to ValidateInvokeRuntime()
exercised by the following patches would fail.

Change-Id: I450571b8b47280a004b714996189ba6db13fb57d
diff --git a/compiler/optimizing/intrinsics_x86.cc b/compiler/optimizing/intrinsics_x86.cc
index 6c81421..9e5bf58 100644
--- a/compiler/optimizing/intrinsics_x86.cc
+++ b/compiler/optimizing/intrinsics_x86.cc
@@ -1216,7 +1216,7 @@
 void IntrinsicLocationsBuilderX86::VisitStringCompareTo(HInvoke* invoke) {
   // The inputs plus one temp.
   LocationSummary* locations = new (arena_) LocationSummary(invoke,
-                                                            LocationSummary::kCallOnMainOnly,
+                                                            LocationSummary::kCallOnMainAndSlowPath,
                                                             kIntrinsified);
   InvokeRuntimeCallingConvention calling_convention;
   locations->SetInAt(0, Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
@@ -1490,7 +1490,7 @@
 
 void IntrinsicLocationsBuilderX86::VisitStringNewStringFromBytes(HInvoke* invoke) {
   LocationSummary* locations = new (arena_) LocationSummary(invoke,
-                                                            LocationSummary::kCallOnMainOnly,
+                                                            LocationSummary::kCallOnMainAndSlowPath,
                                                             kIntrinsified);
   InvokeRuntimeCallingConvention calling_convention;
   locations->SetInAt(0, Location::RegisterLocation(calling_convention.GetRegisterAt(0)));
@@ -1543,7 +1543,7 @@
 
 void IntrinsicLocationsBuilderX86::VisitStringNewStringFromString(HInvoke* invoke) {
   LocationSummary* locations = new (arena_) LocationSummary(invoke,
-                                                            LocationSummary::kCallOnMainOnly,
+                                                            LocationSummary::kCallOnMainAndSlowPath,
                                                             kIntrinsified);
   InvokeRuntimeCallingConvention calling_convention;
   locations->SetInAt(0, Location::RegisterLocation(calling_convention.GetRegisterAt(0)));