8317987: C2 recompilations cause high memory footprint

Backport-of: c88b387881a6e9206f9804b4ca966334c65c008a

Author: tstuefe

src/hotspot/share/opto/c2compiler.cpp

@@ -113,6 +113,7 @@ void C2Compiler::compile_method(ciEnv* env, ciMethod* target, int entry_bci, boo
   bool do_locks_coarsening = EliminateLocks;
 
   while (!env->failing()) {
+    ResourceMark rm;
     // Attempt to compile while subsuming loads into machine instructions.
     Options options(subsume_loads, do_escape_analysis, do_iterative_escape_analysis, eliminate_boxing, do_locks_coarsening, install_code);
     Compile C(env, target, entry_bci, options, directive);