Add VFE test for 32 bit

The offset in the llvm.type.checked.load intrinsic differs on 32 bit platforms

Author: flip1995

src/test/codegen/virtual-function-elimination-32bit.rs

@@ -0,0 +1,35 @@
+// compile-flags: -Zvirtual-function-elimination -Clto -O -Csymbol-mangling-version=v0
+// ignore-64bit
+
+// CHECK: @vtable.0 = {{.*}}, !type ![[TYPE0:[0-9]+]], !vcall_visibility ![[VCALL_VIS0:[0-9]+]]
+
+#![crate_type = "lib"]
+
+trait T {
+    // CHECK-LABEL: ; <virtual_function_elimination_32bit::S as virtual_function_elimination_32bit::T>::used
+    fn used(&self) -> i32 {
+        1
+    }
+    // CHECK-LABEL-NOT: {{.*}}::unused
+    fn unused(&self) -> i32 {
+        2
+    }
+}
+
+#[derive(Copy, Clone)]
+struct S;
+
+impl T for S {}
+
+fn taking_t(t: &dyn T) -> i32 {
+    // CHECK: @llvm.type.checked.load({{.*}}, i32 12, metadata !"[[MANGLED_TYPE0:[0-9a-zA-Z_]+]]")
+    t.used()
+}
+
+pub fn main() {
+    let s = S;
+    taking_t(&s);
+}
+
+// CHECK: ![[TYPE0]] = !{i32 0, !"[[MANGLED_TYPE0]]"}
+// CHECK: ![[VCALL_VIS0]] = !{i64 2}

src/test/codegen/virtual-function-elimination.rs

@@ -1,4 +1,5 @@
 // compile-flags: -Zvirtual-function-elimination -Clto -O -Csymbol-mangling-version=v0
+// ignore-32bit
 
 // CHECK: @vtable.0 = {{.*}}, !type ![[TYPE0:[0-9]+]], !vcall_visibility ![[VCALL_VIS0:[0-9]+]]
 // CHECK: @vtable.1 = {{.*}}, !type ![[TYPE1:[0-9]+]], !vcall_visibility ![[VCALL_VIS0:[0-9]+]]