[libc] [mlir] [clang] [compiler-rt] [libcxx] [clang-tools-extra] [flang] [llvm] [lldb] [X86] Add "Ws" constraint and "p" modifier for symbolic address/label reference (PR #77886)

[Phoebe Wang via cfe-commits]

================
@@ -130,3 +130,7 @@ void pr40890(void) {
   __asm__ __volatile__("\n#define BEEF abcd%0\n" : : 
"n"((int*)0xdeadbeeeeeef));
 #endif
 }
+
+void test_W(int i) {
+  asm("" : : "Wd"(test_W)); // expected-error{{invalid input constraint 'Wd' 
in asm}}
----------------
phoebewang wrote:

And add a positive test?

https://github.com/llvm/llvm-project/pull/77886
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