6953477: Increase portability and flexibility of building Hotspot

A collection of portability improvements including shared code support for PPC, ARM platforms, software floating point, cross compilation support and improvements in error crash detail.

Reviewed-by: phh, never, coleenp, dholmes

hotspot/src/cpu/x86/vm/c1_Runtime1_x86.cpp

@@ -1779,3 +1779,7 @@ OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) {
 }
 
 #undef __
+
+const char *Runtime1::pd_name_for_address(address entry) {
+  return "<unknown function>";
+}