Parser: handle lval_to_rval cast when computing pointer offsets

Author: ehaas

src/aro/Parser.zig

@@ -7134,6 +7134,7 @@ fn computeOffsetExtra(p: *Parser, node: NodeIndex, offset_so_far: *Value) !Value
             const cast_data = data[@intFromEnum(node)].cast;
             return switch (cast_data.kind) {
                 .array_to_pointer => p.computeOffsetExtra(cast_data.operand, offset_so_far),
+                .lval_to_rval => .{},
                 else => unreachable,
             };
         },

test/cases/relocations.c

@@ -59,6 +59,12 @@ void foo(void) {
     _Static_assert(&local < &local + 1, "");
     _Static_assert(&(int){5} != &(int){5}, "");
 }
+
+char *bar(char *p) {
+    _Static_assert(&p[0] == &p[0], "");
+    char *p2 = &p[1];
+    return p2;
+}
 #define EXPECTED_ERRORS "relocations.c:24:1: error: static assertion failed" \
     "relocations.c:29:16: error: static_assert expression is not an integral constant expression" \
     "relocations.c:30:16: error: static_assert expression is not an integral constant expression" \
@@ -67,4 +73,5 @@ void foo(void) {
     "relocations.c:50:26: warning: subtraction of pointers to type 'union Empty' of zero size has undefined behavior [-Wpointer-arith]" \
     "relocations.c:50:16: error: static_assert expression is not an integral constant expression" \
     "relocations.c:60:20: error: static_assert expression is not an integral constant expression" \
+    "relocations.c:64:20: error: static_assert expression is not an integral constant expression" \