Extend the objc_msgSend test to check for register saving.

Ensure, when we bounce out from the assembly into C and back again, that
the argument values are preserved.  Tests 10 integer and 10 floating
point arguments, which should cover all of the argument registers and at
least one stack slot on all supported platforms.

Test/objc_msgSend.m

@@ -4,6 +4,7 @@
 #include <string.h>
 #include <stdarg.h>
 #include "../objc/runtime.h"
+#include "../objc/hooks.h"
 
 //#define assert(x) if (!(x)) { printf("Failed %d\n", __LINE__); }
 
@@ -23,7 +24,31 @@ Class TestCls;
 __attribute__((objc_root_class))
 #endif
 #endif
-@interface Test { id isa; }@end
+@interface Test { id isa; } @end
+@interface Test (Dynamic)
++ (void)manyArgs: (int)a0
+         : (int) a1
+         : (int) a2
+         : (int) a3
+         : (int) a4
+         : (int) a5
+         : (int) a6
+         : (int) a7
+         : (int) a8
+         : (int) a9
+         : (int) a10
+         : (float) f0
+         : (float) f1
+         : (float) f2
+         : (float) f3
+         : (float) f4
+         : (float) f5
+         : (float) f6
+         : (float) f7
+         : (float) f8
+         : (float) f9
+         : (float) f10;
+@end
 @implementation Test 
 - foo
 {
@@ -70,8 +95,65 @@ __attribute__((objc_root_class))
 }
 + nothing { return 0; }
 @end
+
+int forwardcalls;
+void fwd(int a0,
+         int a1,
+         int a2,
+         int a3,
+         int a4,
+         int a5,
+         int a6,
+         int a7,
+         int a8,
+         int a9,
+         int a10,
+         float f0,
+         float f1,
+         float f2,
+         float f3,
+         float f4,
+         float f5,
+         float f6,
+         float f7,
+         float f8,
+         float f9,
+         float f10)
+{
+	forwardcalls++;
+	assert(a0 == 0);
+	assert(a1 == 0);
+	assert(a2 == 0);
+	assert(a3 == 0);
+	assert(a4 == 0);
+	assert(a5 == 0);
+	assert(a6 == 0);
+	assert(a7 == 0);
+	assert(a8 == 0);
+	assert(a9 == 0);
+	assert(a10 == 10);
+	assert(f0 == 0);
+	assert(f1 == 0);
+	assert(f2 == 0);
+	assert(f3 == 0);
+	assert(f4 == 0);
+	assert(f5 == 0);
+	assert(f6 == 0);
+	assert(f7 == 0);
+	assert(f8 == 0);
+	assert(f9 == 0);
+	assert(f10 == 10);
+}
+
+IMP forward(id o, SEL s)
+{
+	assert(o == objc_getClass("Test"));
+	return (IMP)fwd;
+}
+
 int main(void)
 {
+	__objc_msg_forward2 = forward;
 	TestCls = objc_getClass("Test");
 	int exceptionThrown = 0;
 	@try {
@@ -114,6 +196,7 @@ int main(void)
 	assert(0 == [f dzero]);
 	assert(0 == [f ldzero]);
 	assert(0 == [f fzero]);
+	[TestCls manyArgs: 0 : 1 : 2 : 3: 4: 5: 6: 7: 8: 9: 10 : 0 : 1 : 2 : 3 : 4 : 5 : 6 : 7 : 8 : 9 : 10];
 #ifdef BENCHMARK
 	clock_t c1, c2;
 	c1 = clock();