re PR libgcj/51500 (106 unexpected libjava testsuite failures with mingw32)

PR target/51500
	* interpret.cc (_Jv_init_cif): Handle thiscall
	convention for 32-bit Windows.
	* java/lang/reflect/natMethod.cc (_Jv_CallAnyMethodA):
	Likewise.
	* java/lang/reflect/natVMProxy.cc (invoke_t): Add
	thiscall-attribute for 32-bit Windows.

From-SVN: r183794

libjava/java/lang/reflect/natMethod.cc

@@ -436,7 +436,12 @@ _Jv_CallAnyMethodA (jobject obj,
       p += size_per_arg;
     }
 
-  if (ffi_prep_cif (&cif, FFI_DEFAULT_ABI, param_count,
+  ffi_abi cabi = FFI_DEFAULT_ABI;
+#if defined (X86_WIN32) && !defined (__CYGWIN__)
+  if (needs_this)
+    cabi = FFI_THISCALL;
+#endif
+  if (ffi_prep_cif (&cif, cabi, param_count,
 		    rtype, argtypes) != FFI_OK)
     throw new java::lang::VirtualMachineError(JvNewStringLatin1("internal error: ffi_prep_cif failed"));
 

libjava/java/lang/reflect/natVMProxy.cc

@@ -79,7 +79,11 @@ typedef void (*closure_fun) (ffi_cif*, void*, void**, void*);
 static void *ncode (int method_index, jclass klass, _Jv_Method *self, closure_fun fun);
 static void run_proxy (ffi_cif*, void*, void**, void*);
 
-typedef jobject invoke_t (jobject, Proxy *, Method *, JArray< jobject > *);
+typedef jobject
+#if defined (X86_WIN32) && !defined (__CYGWIN__)
+ __attribute__ ((thiscall))
+#endif
+ invoke_t (jobject, Proxy *, Method *, JArray< jobject > *);
 
 // True if pc points to a proxy frame.