Rephrase comment to include some tracking issues

Signed-off-by: Jens Reidel <[email protected]>

Author: Gelbpunkt

tests/debuginfo/basic-types-globals-metadata.rs

@@ -60,8 +60,10 @@ fn main() {
     _zzz(); // #break
 
     let a = unsafe { (B, I, C, I8, I16, I32, I64, U, U8, U16, U32, U64, F32, F64) };
-    // N.B. Including f16 and f32 in the same tuple emits `__gnu_h2f_ieee`, which does
-    // not exist on some targets like PowerPC
+    // FIXME: Including f16 and f32 in the same tuple emits `__gnu_h2f_ieee`, which
+    // does not exist on some targets like PowerPC.
+    // See https://github.com/llvm/llvm-project/issues/97981 and
+    // https://github.com/rust-lang/compiler-builtins/issues/655
     let b = unsafe { F16 };
 }
 

tests/debuginfo/basic-types-globals.rs

@@ -64,8 +64,10 @@ fn main() {
     _zzz(); // #break
 
     let a = unsafe { (B, I, C, I8, I16, I32, I64, U, U8, U16, U32, U64, F32, F64) };
-    // N.B. Including f16 and f32 in the same tuple emits `__gnu_h2f_ieee`, which does
-    // not exist on some targets like PowerPC
+    // FIXME: Including f16 and f32 in the same tuple emits `__gnu_h2f_ieee`, which
+    // does not exist on some targets like PowerPC.
+    // See https://github.com/llvm/llvm-project/issues/97981 and
+    // https://github.com/rust-lang/compiler-builtins/issues/655
     let b = unsafe { F16 };
 }