r18 only on Linux

Author: lewurm

src/hotspot/cpu/aarch64/register_aarch64.cpp

@@ -41,7 +41,7 @@ const char* RegisterImpl::name() const {
     "c_rarg0", "c_rarg1", "c_rarg2", "c_rarg3", "c_rarg4", "c_rarg5", "c_rarg6", "c_rarg7",
     "rscratch1", "rscratch2",
     "r10", "r11", "r12", "r13", "r14", "r15", "r16",
-    "r17", NOT_R18_RESERVED("r18") WIN64_ONLY("rtls"), "r19",
+    "r17", LINUX_ONLY("r18") WIN64_ONLY("rtls"), "r19",
     "resp", "rdispatch", "rbcp", "r23", "rlocals", "rmonitors", "rcpool", "rheapbase",
     "rthread", "rfp", "lr", "sp"
   };