Tighten up assertions checking GC-safety of stub calls.

src/mips/code-stubs-mips.cc

Index: src/mips/code-stubs-mips.cc
diff --git a/src/mips/code-stubs-mips.cc b/src/mips/code-stubs-mips.cc
index f64973a6e95402428ccde461f7436a981bc329af..b5ecc68ee0d4e51a98fa7f034ff76be40ffcd66a 100644
--- a/src/mips/code-stubs-mips.cc
+++ b/src/mips/code-stubs-mips.cc
@@ -3477,7 +3477,7 @@ bool CEntryStub::NeedsImmovableCode() {
 }
 
 
-bool CEntryStub::CompilingCallsToThisStubIsGCSafe() {
+bool CEntryStub::IsPregenerated() {
   return (!save_doubles_ || ISOLATE->fp_stubs_generated()) &&
           result_size_ == 1;
 }