ART: Fix typo in IsCallerSave

Correctly refer to floating point registers, if necessary. This
ensures that we correctly start allocating caller-save FPRs.

Bug: 31275200
Test: ART_TEST_OPTIMIZING_GRAPH_COLOR=true m test-art-host
Change-Id: I420b66f0a000636e8370c739003de3cf53af3e30
diff --git a/compiler/optimizing/register_allocator_graph_color.cc b/compiler/optimizing/register_allocator_graph_color.cc
index aa0d371..9064f86 100644
--- a/compiler/optimizing/register_allocator_graph_color.cc
+++ b/compiler/optimizing/register_allocator_graph_color.cc
@@ -1749,7 +1749,7 @@
 bool RegisterAllocatorGraphColor::IsCallerSave(size_t reg, bool processing_core_regs) {
   return processing_core_regs
       ? !codegen_->IsCoreCalleeSaveRegister(reg)
-      : !codegen_->IsCoreCalleeSaveRegister(reg);
+      : !codegen_->IsFloatingPointCalleeSaveRegister(reg);
 }
 
 static bool RegisterIsAligned(size_t reg) {