[compiler-rt] [llvm] [msan] Add 32-bit platforms support (PR #109284)

[Vitaly Buka via llvm-commits]

================
@@ -111,11 +113,28 @@ define dso_local i64 @many_args() {
 ; CHECK-NEXT:    store i64 0, ptr inttoptr (i64 add (i64 ptrtoint (ptr @__msan_param_tls to i64), i64 776) to ptr), align 8
 ; CHECK-NEXT:    store i64 0, ptr inttoptr (i64 add (i64 ptrtoint (ptr @__msan_param_tls to i64), i64 784) to ptr), align 8
 ; CHECK-NEXT:    store i64 0, ptr inttoptr (i64 add (i64 ptrtoint (ptr @__msan_param_tls to i64), i64 792) to ptr), align 8
+; CHECK-NEXT:    store i64 0, ptr @__msan_va_arg_tls, align 8
 ; CHECK-NEXT:    store i64 0, ptr inttoptr (i64 add (i64 ptrtoint (ptr @__msan_va_arg_tls to i64), i64 8) to ptr), align 8
 ; CHECK-NEXT:    store i64 0, ptr inttoptr (i64 add (i64 ptrtoint (ptr @__msan_va_arg_tls to i64), i64 16) to ptr), align 8
 ; CHECK-NEXT:    store i64 0, ptr inttoptr (i64 add (i64 ptrtoint (ptr @__msan_va_arg_tls to i64), i64 24) to ptr), align 8
 ; CHECK-NEXT:    store i64 0, ptr inttoptr (i64 add (i64 ptrtoint (ptr @__msan_va_arg_tls to i64), i64 32) to ptr), align 8
 ; CHECK-NEXT:    store i64 0, ptr inttoptr (i64 add (i64 ptrtoint (ptr @__msan_va_arg_tls to i64), i64 40) to ptr), align 8
+; CHECK-NEXT:    store i64 0, ptr inttoptr (i64 add (i64 ptrtoint (ptr @__msan_va_arg_tls to i64), i64 48) to ptr), align 8
----------------
vitalybuka wrote:

do you know why we get these new stores?

https://github.com/llvm/llvm-project/pull/109284