Remember byval argument's frame index during argument lowering and use this info to emit debug info.

Fixes Radar 8367011.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112623 91177308-0d34-0410-b5e6-96231b3b80d8

test/FrontendC++/2010-08-31-ByValArg.cpp

@@ -0,0 +1,53 @@
+// This regression test checks byval arguments' debug info.
+// Radar 8367011
+// RUN: %llvmgcc -S -O0 -g %s -o - | \
+// RUN:    llc --disable-fp-elim -o %t.s -O0 -relocation-model=pic
+// RUN: %compile_c %t.s -o %t.o
+// RUN: %link %t.o -o %t.exe
+// RUN: echo {break get\nrun\np missing_arg.b} > %t.in 
+// RUN: gdb -q -batch -n -x %t.in %t.exe | tee %t.out | \
+// RUN:   grep {1 = 4242}
+
+// XTARGET: x86_64-apple-darwin
+
+class EVT {
+public:
+  int a;
+  int b;
+  int c;
+};
+
+class VAL {
+public:
+  int x;
+  int y;
+};
+void foo(EVT e);
+EVT bar();
+
+void get(int *i, unsigned dl, VAL v, VAL *p, unsigned n, EVT missing_arg) {
+//CHECK: .ascii "missing_arg"
+  EVT e = bar();
+  if (dl == n)
+    foo(missing_arg);
+}
+
+
+EVT bar() {
+	EVT e;
+	return e;
+}
+
+void foo(EVT e) {}
+
+int main(){
+	VAL v;
+	EVT ma;
+	ma.a = 1;
+	ma.b = 4242;
+	ma.c = 3;
+	int i = 42;	
+	get (&i, 1, v, &v, 2, ma);
+	return 0;
+}
+