Error codes specific to LLVM-style inline asssembly are no longer emitted

Author: tmiasko

Diff for: compiler/rustc_error_codes/src/error_codes/E0660.md

@@ -1,12 +1,9 @@
+#### Note: this error code is no longer emitted by the compiler.
+
 The argument to the `llvm_asm` macro is not well-formed.
 
 Erroneous code example:
 
-```compile_fail,E0660
+```ignore (no longer emitted)
 llvm_asm!("nop" "nop");
 ```
-
-Considering that this would be a long explanation, we instead recommend you
-take a look at the [`llvm_asm`] chapter of the Unstable book:
-
-[`llvm_asm`]: https://doc.rust-lang.org/stable/unstable-book/library-features/llvm-asm.html

Diff for: compiler/rustc_error_codes/src/error_codes/E0661.md

@@ -1,13 +1,10 @@
+#### Note: this error code is no longer emitted by the compiler.
+
 An invalid syntax was passed to the second argument of an `llvm_asm` macro line.
 
 Erroneous code example:
 
-```compile_fail,E0661
+```ignore (no longer emitted)
 let a;
 llvm_asm!("nop" : "r"(a));
 ```
-
-Considering that this would be a long explanation, we instead recommend you
-take a look at the [`llvm_asm`] chapter of the Unstable book:
-
-[`llvm_asm`]: https://doc.rust-lang.org/stable/unstable-book/library-features/llvm-asm.html

Diff for: compiler/rustc_error_codes/src/error_codes/E0662.md

@@ -1,16 +1,13 @@
+#### Note: this error code is no longer emitted by the compiler.
+
 An invalid input operand constraint was passed to the `llvm_asm` macro
 (third line).
 
 Erroneous code example:
 
-```compile_fail,E0662
+```ignore (no longer emitted)
 llvm_asm!("xor %eax, %eax"
           :
           : "=test"("a")
          );
 ```
-
-Considering that this would be a long explanation, we instead recommend you
-take a look at the [`llvm_asm`] chapter of the Unstable book:
-
-[`llvm_asm`]: https://doc.rust-lang.org/stable/unstable-book/library-features/llvm-asm.html

Diff for: compiler/rustc_error_codes/src/error_codes/E0663.md

@@ -1,16 +1,13 @@
+#### Note: this error code is no longer emitted by the compiler.
+
 An invalid input operand constraint was passed to the `llvm_asm` macro
 (third line).
 
 Erroneous code example:
 
-```compile_fail,E0663
+```ignore (no longer emitted)
 llvm_asm!("xor %eax, %eax"
           :
           : "+test"("a")
          );
 ```
-
-Considering that this would be a long explanation, we instead recommend you
-take a look at the [`llvm_asm`] chapter of the Unstable book:
-
-[`llvm_asm`]: https://doc.rust-lang.org/stable/unstable-book/library-features/llvm-asm.html

Diff for: compiler/rustc_error_codes/src/error_codes/E0664.md

@@ -1,16 +1,13 @@
+#### Note: this error code is no longer emitted by the compiler.
+
 A clobber was surrounded by braces in the `llvm_asm` macro.
 
 Erroneous code example:
 
-```compile_fail,E0664
+```ignore (no longer emitted)
 llvm_asm!("mov $$0x200, %eax"
           :
           :
           : "{eax}"
          );
 ```
-
-Considering that this would be a long explanation, we instead recommend you
-take a look at the [`llvm_asm`] chapter of the Unstable book:
-
-[`llvm_asm`]: https://doc.rust-lang.org/stable/unstable-book/library-features/llvm-asm.html

Diff for: compiler/rustc_error_codes/src/error_codes/E0668.md

@@ -1,8 +1,10 @@
+#### Note: this error code is no longer emitted by the compiler.
+
 Malformed inline assembly rejected by LLVM.
 
 Erroneous code example:
 
-```compile_fail,E0668
+```ignore (no longer emitted)
 #![feature(llvm_asm)]
 
 fn main() {

Diff for: compiler/rustc_error_codes/src/error_codes/E0669.md

@@ -1,8 +1,10 @@
+#### Note: this error code is no longer emitted by the compiler.
+
 Cannot convert inline assembly operand to a single LLVM value.
 
 Erroneous code example:
 
-```compile_fail,E0669
+```ignore (no longer emitted)
 #![feature(llvm_asm)]
 
 fn main() {