Remove pretty tests for LLVM-style inline assembly

Author: tmiasko

src/test/pretty/llvm-asm-clobbers.rs

@@ -1,8 +1,8 @@
 // pp-exact
 
-#![feature(llvm_asm)]
-
 #[cfg(foo = r#"just parse this"#)]
 extern crate blah as blah;
 
-fn main() { unsafe { llvm_asm!(r###"blah"###); } }
+use std::arch::asm;
+
+fn main() { unsafe { asm!(r###"blah"###); } }