Only pass isolate parameter to C helper functions that need it.

src/x64/full-codegen-x64.cc

Index: src/x64/full-codegen-x64.cc
diff --git a/src/x64/full-codegen-x64.cc b/src/x64/full-codegen-x64.cc
index 90afd85717aed577a26ecdc83ee891f6270e82ce..d5aad91d297fe2dbc69497478469db0aadeeb16c 100644
--- a/src/x64/full-codegen-x64.cc
+++ b/src/x64/full-codegen-x64.cc
@@ -2693,8 +2693,13 @@ void FullCodeGenerator::EmitRandomHeapNumber(ZoneList<Expression*>* args) {
 
   // Return a random uint32 number in rax.
   // The fresh HeapNumber is in rbx, which is callee-save on both x64 ABIs.
-  __ PrepareCallCFunction(0);
-  __ CallCFunction(ExternalReference::random_uint32_function(isolate()), 0);
+  __ PrepareCallCFunction(1);
+#ifdef _WIN64
+  __ LoadAddress(rcx, ExternalReference::isolate_address());
+#else
+  __ LoadAddress(rdi, ExternalReference::isolate_address());
+#endif
+  __ CallCFunction(ExternalReference::random_uint32_function(isolate()), 1);
 
   // Convert 32 random bits in rax to 0.(32 random bits) in a double
   // by computing: